On the trademark chasing thing: and not chasing Twitterholic etc. I'd call that fair enough: Twitterholic is a neat, non offensive service that plays by Twitters rules. On the other hand MyTwitterButler is something Twitter might not want to be associated with.
I dont know: I think it's fair to use your trademark power in that case?
I dont know: I think it's fair to use your trademark power in that case?