The power of python programming in Blender and the development skills of Bart Crouch combine to bring us two much-needed tools for Blender. Actually, it's far more than two, if you include the many tools in the LoopTools addon.
Sharing custom themes for Blender 2.5 used to be difficult, as you had to share entire .blend files, replace your default .blend and then manually reorganize your start-up screen with the new colours. That's why I'm introducing: Theme manager
More info on the Theme Manager...
The LoopTools add-on is a script containing a collection of tools to aid mesh modelling in Blender.
More info on LoopTools...