Other wiki's

Looking at many user pages I have found that most people are on more than one wiki which is good but the more wiki's you are on the harder it is to contribute to all of these everyday, for example I am on 5 wiki's at the moment and it is hard to co-ordinate between all the wiki's. This is an open blog post so feel free to say whatever. Give your thoughts on the matter and any suggestions on what they could do to make it simpler to go on more wiki's. Also what is your favourite wiki?