You mentioned that you've got both iM 4 and FCP HD.
If they're both installed on the same Mac, be aware of Apple's warning that there may be a conflict (..this doesn't apply to iMovie 5/HD):
http://docs.info.apple.com/article.html?artnum=93804
I think Karl once had a workaround which involves an Applescript reading the date & time data and feeding it into QuickTime to overlay it on top of video, but Mark's suggestion about taking it out via analogue and converting that back to digital is the 'truest' method ..which is what you want in a court of law, isn't it?
That would also work with FCP ..it's a
method which is entirely independent of the capture
program you're using.