The reason why Logic9 doesn't have the Export Audio To Movie feature is the current state of Quicktime. Remember that the basic video capabilities of Logic are not written into the Logic code but outsourced to the Quicktime components in OSX (Don't invent the wheel twice). Based on a statement by Steve Jobs, the new Final Cut version should arrive in 2011 and you might think it will be 64bit, dragging QuickTime along with it, followed by a quick Logic update - maybe.
If this helps, here is my current workaround:
I work in 64bit with a separate project file for each music cue on a video based project. When I'm done, I bounce the audio.
Now I have also one master project, that also uses the current video and has the exact (important) sync settings. I use that project to import each previously bounced audio cue. If your sync settings are the same with all the individual projects and the master projects then you can import one or many audio files and with one command "Move to original recording position" all the audio files line up perfectly in sync.
The advantages of that master project:
* You run that project in 32bit mode and therefore are able to use "Export audio to movie"
* You can make rough mixes of your video (audio against dialog) for approvals or your own reference. Having these little videos with you at the dubbing stage can take prove very easy if the music editor messed up your cue.
* You can export videos of individual cues, sections or the whole video (at least reels, if the movie is broken down in separate reels)
* Easy handling/mixing of separate cues that overlap
* Quick comparison of different versions of a cue which of course are all imported into the master project
* Quick timing references for Cue Sheet preperation
* In case of a picture edit, this the master project is also an amazing tool to figure out how messed up your music will be with the new picture cut. Import the new video and you can quickly move the out of sync audio files to figure out what the "damage" will be.