A lot of people go on about how search-engines don't like frames-based pages. Personally I never found that to be the case. Commercial sites I made listed well with proper meta tagging in the frameset pages.
I think frames is your best bet for a Flash-nav and HTML content combo.
Please don't email or PM
me Flash questions, that's what the Forums are for!
Please don't rely on me reading my PMs either. Email me about important stuff.