Flip4Mac does an EXCELLENT job converting to WMV. I'd recommend using version 1.0.6 at the moment (you can download that after purchase). I'm a beta tester. Expect more improvements from them. If you want most control get Flip4Mac Studio Pro HD. It does 2 pass encoding and can do WMV HD too. It'll also work in several "front ends" such as Cleaner and Compressor 2 as well as QuicktimePro, FCP and iMovie too.