Mike's hooked you up.
Flip4Mac is major flexible especially if you get the the Studio Pro version. You can output from QuickTimePro, FCE, FCP, iMovie. You can use it in Cleaner and Squeeze4.1 for additional tweaking. It can output WMV HD.
On the input side you can play WMV in QuicktimePro and save as MOV. You can also input and edit WMV in Quicktime Pro, iMoive, FCE, FCP.
In very preliminary tests I'm finding you can import and export out of SoundtrackPro, Export out of Livetype 2 after the movie is rendered.