For those of us who are interested in creating own addons the difference between the two live server versions is rather interesting. It tells us what was changed on the Blizzard UI and how the new functions look like.

Blizzard UI patch 3.0.2 version 9056
http://wowcompares.com/3029056

Blizzard UI patch 2.4.3 version 8606
http://wowcompares.com/2438606

Diff 2.4.3 --> 3.0.2
http://wowcompares.com/3029056?diff=2438606
or
r196 - rothui - Google Code

Example: minimap.lua
Example: actionbutton.lua

They seriously went with Python-style scope passing? Is there any logical reason for this? (pun not intended)