Uh oh...this is going to make me slightly biased towards Mybase in my extra-long notetaking thread. I'll have to try to keep it objective. Mybase is one of those notetaking programs that does something very well, but still makes me afraid to commit to because I still feel the notetaking genre is still in it's primitive stages and it's very unclear who will come out as the leader of the pack. Fortunately, I think Mybase has the best exporting/importing features of all the programs, so a change either way should be least painful with it.
Seriously, thanks mouser. This site has been much too generous.