LiquidFeedback

LiquidFeedback is a German site that advocates a similar form of Interactive Democracy to this site. While I have tended towards delegating your vote to your MP whenever you want, LiquidFeedback proposes that you can delegate your vote to any other person, and a different person for each topic.
I don't necessarily object to this, but delegating to your MP may be a smaller step in implementing Interactive Democracy. At a later date any aspect of ID can be changed through the Initiative/Referendum process itself.