This is a brief summary of changes for each build, number in brackets (x) indicate the number of changes.

Build 5.5330 - May 4th 2012
Loremaster Guides
* Fixed missing Southern Barrens guide

Build 5.5320 - May 4th 2012
Dugi Guides Addon
* Fixed compatibility issue with carbonite (map flashing) 

Build 5.5315 - April 29th 2012
Event Guides
* Children's Week guide fixes 

Build 5.5310 - April 29th 2012
Event Guides
* Children's Week event guides are now available in the event tab covering all quests and achievements. 

Build 5.5303 - April 20th 2012
Dugi Guides Addon
* Fixed new vendor guides that are not appearing for paid users. 

Build 5.5300 - April 20th 2012
Dailies Guide 
* New Vendor Run guides, watch http://www.ultimatewowguide.com/dgmembers/gold/bonus/vendor-run/
* Orgrimmar Vendor Run
* Thunder Bluff Vendor Run
* Undercity Vendor Run
* Silvermoon City Vendor Run
* Stormwind City Vendor Run
* Darnassus Vendor Run
* Ironforge Vendor Run
* The Exodar Vendor Run

Build 5.5212 - April 14th 2012
Dugi Guides Addon 
* Fixed compatibility issue with XLoot 1.0 addon. 

Build 5.5210 - April 12th 2012
Dugi Guides Addon 
* Fixed "/dugi fix" (No Guide Loaded) problem and errors for high level character without the complete leveling guides installed.

Build 5.5204 - April 3rd 2012
Profession Guides
* A Tailoring (8)
* A Tailoring_Farm_A (8)
* H Tailoring (8)
* H Tailoring_Farm_H (8)

Build 5.5200 - April 2nd 2012
Dugi Guides Addon
* Fixed Target button customize feature

Achievement Guides 
* New Dungeons and Raids achievement guides
* A Accomplished_Angler_A (19)
* A Cenarion_Circle_A (16)
* H Accomplished_Angler_H (19)

Profession Guides
* A Engineering (17)
* A Engineering_Farm_A (31)
* H Engineering (17)
* H Engineering_Farm_H (33)

Leveling Guides
* A 76_78_Sholazar_Basin (2)
* H 10_20_North_Barrens (3)
* H 01_05_Durotar_Orc (8)
* H 01_05_Durotar_Troll (1)
* H 01_10_Mulgore_Tauren (6)
* H 01_10_Tirisfal_Glades_Undead (29)
* H 01_12_Eversong_Blood_Elf (43)
* H 05_10_Durotar_Orc_Troll (13)
* H 10_20_Ghostlands (6)
* H 10_20_North_Barrens (59)
* H 10_20_Silverpine_Forest (28)

Build 5.5150 - March 10th 2012
Dugi Guides Addon
* Fixed ActionItemFrame lua error 3
* NPC Model database update

Achievement Guides
* Fixed Veteran of the Molten Front guide not appearing in the list. 
* A Exploration_Kalimdor_A (26)
* A Mounts_A (8)
* A Well_Read_A (8)
* H Exploration_Kalimdor_H (30)
* H Mounts_H (8)
* H Well_Read_H (16)

Build 5.5130 - March 2nd 2012
Dugi Guides Addon
* Fixed ActionItemFrame lua error 2 
* Fixed Carbonite waypoint arrow not using the correct zone