Here's a guide to help you decipher what all those letters actually mean.  I know I'm missing a lot of titles.  Please feel free to e-mail me with additional titles or venues.  I'd like to make this page as complete as possible.
A, B, C, D, E, F, G...All these letters are greek to me...
Agility
Tracking
Conformation
Herding/Stockdog
Obedience
Earth Dog
RS-N Regular Standard Novice
JS-N Jumpers Standard Novice
GS-N Gamblers Standard Novice
RS-O Regular Standard Open
JS-O Jumpers Standard Open
GS-O Gamblers Standard Open
RS-E Regular Standard Elite
JS-E Jumpers Standard Elite
GS-E Gamblers Standard Elite
ATCH Agility Trial Champion

Lure Coursing
NA Novice Agility                                              NAJ Novice Jumpers with Weaves                    
OA Open Agility                                              
OAJ Open  Jumpers with Weaves                     
AX Excellent Agility                                         
AXJ Excellent Jumpers with Weaves                
MX Master Agility Excellent                            
MXJ Master Excellent Jumpers with Weaves   
MACH Master Agility Champion
A number after "MACH" indicates the number of times that dog has achieved that title.
NAP Novice Agility Preferred
NJP Novice Jumpers with Weaves  Preferred
OAP Open Agility Preferred
OJP Open Jumpers with Weaves  Preferred
AXP Excellent Agility Preferred
AJP Excellent Jumpers with Weaves  Preferred
MXP Master Agility Excellent Preferred
MJP Master Excellent Jumpers with Weaves Preferred


AKC-American Kennel Club
ASCA- Australian Shepherd Club of America
NADAC-North American Dog Agility Council
NAC Novice Agility Certificate
NGC Novice Gamblers Certificate
NJC Novice Jumpers Certificate
TN-N Novice Tunnelers Certificate
TG-N Novice Touch N Go Certificate
WV-N Novice Weavers Certificate
OAC Open Agility Certificate
ONGC Open Gamblers Certificate
ONJC Open Jumpers Certificate
TN-O Open Tunnelers Certificate
TG-O Open Touch N Go Certificate
WV-O Open Weavers Certificate
EAC Elite Agility Certificate
EGC Elite  Gamblers Certificate
EJC Elite  Jumpers Certificate
TN-E Elite  Tunnelers Certificate
TG-E Elite  Touch N Go Certificate
WV-E Elite  Weavers Certificate
NATCH NADAC Agility Trial Champion
Vers-NATCH NADAC Versatility Champion

UKC-United Kennel Club
CH Champion
UAGI Agility I Title
UAGII Agility II Title
UACH Agility Champion Title
UACHX Agility Champion Excellent Title
If the title is followed by "-V'" that indicates that the dog is a veteran. 
If the title is followed by "-JH" that indicates that it was earned by a Junior Handler.
If the title is preceeded by "O-" that indicates Outstanding Performance. 
If the title is preceeded by "S-" that indicates Superior Performance.
Championship Program
AD Agility Dog
SSA Starters Agility Dog
SJ Starters Jumper
SG Starters Gambler
SS Starters Snooker
SR Starters Relay
AAD Advanced Agility Dog
ASA Advanced Standard Agility
AJ Advanced Jumper
AG Advanced Ganbler
AS Advanced Snooker
AR Advanced Relay
MAD Master Agility Dog
SAM Standard Agility Master
JM Jumper Master
GM Gambler Master
SM Snooker Master
RM Relay Master
ADCH Agility Dog Champion
TM Tournament Master
SACH Standard Agility Champion
JCH Jumpers Champion
GCH Gamblers Champion
SCH Snooker Champion
RCH Relay Champion
Teacup Agility
International Kennel Club
TBAD Teacup Beginner Agile Dog
TG1 Teacup Games I
TIAD Teacup Intermediate Agile Dog
TG2 Teacup Games II
TSAD Teacup Superior Agile Dog
TG3 Teacup Games III
TACh Teacup Agile Dog Champion
Performance Program
PD1 Performance Dog I
PS1 Performance Standard I
PJ1 Performance Jumpers I
PG1 Performance Gamblers I
PK1 Performance Snooker I

PD2 Performance Dog II
PS2 Performance Standard II
PJ2 Performance Jumpers II
PG2 Performance Gamblers II
PK2 Performance Snooker II

PD3 Performance Dog III
PS3 Performance Standard III
PJ3 Performance Jumpers III
PG3 Performance Gamblers III
PK3 Performance Snooker III

APD Accomplished Performance Dog
ATDAccomplished Tournament Dog
ASD Accomplished Standard Dog
AJD Accomplished Jumpers Dog
AGD Accomplished Gamblers Dog
AKD Accomplished Snooker Dog
USDAA-United States Dog Agility Association
If the letter "S" is replaced with a "V" that indicates that the title was earned by a veteran dog. 
If the "S" is replaced with a "J" that indicates that the title was earned by a Junior Handler. 
If the title is followed by a "-OP" that indicates Outstanding Performance. 
If the title is followed by "-SP" that indicates Superior Performance.
AKC-American Kennel Club
AKC-American Kennel Club
AKC-American Kennel Club
ASCA- Australian Shepherd Club of America
ASCA- Australian Shepherd Club of America
ASCA- Australian Shepherd Club of America
A-CH Altered Champion
CH Champion
UKC-United Kennel Club
UKC-United Kennel Club
UKC-United Kennel Club
CH Champion
IQ Introduction to Quarry
JE Junior Earthdog
SE Senior Earthdog
ME Master Earthdog
Hunting
AKC-American Kennel Club
AKC-American Kennel Club
AKC-American Kennel Club
JC Junior Courser
SC Senior Courser
MC Master Courser
FC Field Championship
LCX Lure Courser Excellent
The LCX may be followed by a number to indicate how many times the  hound has achieved that title.
CGC Canine Good Citizen
CD Companion Dog
CDX Companion Dog Excellent
UD Utility Dog
UDX Utility Dog Excellent
OTCH Obedience Trial Champion
The titles HS, HI & HX will be followed by an "A", "B", or "C" to indicate which course the title was earned on.  The "A", "B", or "C" will be followed by a "c", "s", or "d" to indicate the type of livestock--cattle, sheep or ducks.
STD Started Trial Dog
OTD Open Trial Dog
ATD Advanced Trial Dog
PATD Post Advanced Trial Dog
RD Ranch Dog
RTD Ranch Trial Dog
WTCH Working Trial Champion
HT Herding Tested
PT Pre-Trial Tested
HS Herding Started
HI Herding Intermediate
HX Herding Excellent
     Herding Champion
With the exception of the RD & the WTCH all of the titles will be followed by a "c", "s", or "d" to indicate the type of livestock--cattle, sheep or ducks.
Rally Obedience
ASCA- Australian Shepherd Club of America
AKC-American Kennel Club
UKC-United Kennel Club
CD Companion Dog
CDX Companion Dog Excellent
UD Utility Dog
UDX Utility Dog Excellent
OTCH Obedience Trial Champion
A number after the UDX or OTCH indicates the number of times the dog has earned that title.
UCD United Companion Dog
UCDX United Companion Dog Excellent
UUD United Utility Dog
UOCH United Obedience Champion Dog
GOCH United Grand Obedience Champion
RN Rally Novice
RA Rally Advanced
RE Rally Excellent
RAE Rally Advanced Excellent
TD Tracking Dog
TDX Tracking Dog Excellent
VST Variable Surface Tracker
A number after the RAE indicates the number of times the dog has earned that title.
Terrier Racing
UR United Flat Racer
USR United Steeplechase Racer
URCH United Flat Racer Champion
USRCH United Steeplechase Champion
TD Tracking Dog
TDX Tracking Dog Excellent
UDTX Utility Dog Tracker Excellent
Weight Pulling
UWP United Weight Puller
UWPCH United Weight Pull Champion
UWPCHX United Weight Pull Champion Excellent
UWPCHV United Weight Pull Champion Versatile
UWPCHO United Weight Pull Champion Outstanding
UWPCHS United Weight Pull Champion Supreme