As usual I'm behind the curve but I have finally started to use Wizards of the Coast's Character Builder for my current character, Uthek Van'tar (a Dragonborn Warlord). Until now I only had Character Builder in the Beta Version (up to level 3) so the fully functional Character Builder is something of a revelation to me.I particularly like the Shop feature which makes adding and equipping items very easy.
Indeed this programme addresses many of the problems I have with the game in general and the proliferation of sourcebooks and rules specifically. Character builder brings them all together and makes it easy to compare and choose (for instance) the feats you want to use. It makes a change for me to give an unreserved thumbs up to a WoTC product, but in this case I'll make an exception.