My co-worker is a Mac user and has FCP 6.0.4; I'm a Vegas 9 user.

We're trying to share files back and forth, and right now the only format I can render to in Vegas, that his FCP rig accepts is PhotoJpeg in Quicktime.

There's no Quicktime H.264 and no Quicktime MPEG2 options in Vegas. Only Quicktime PhotoJpeg, H.263, and other formats.