You should keep in mind that Komodo 4.0 is still in beta (though a pretty stable beta - it's worked fine for me). If you're looking for a release version, try out 3.5.
I just finished talking to the guys at ActiveState, and it turns out that Komodo 4.0 was released just this afternoon. Also, they've got a new version of their product in Beta, basically a "Komodo Lite" called Komodo Edit.