Most Search Engines ignore Flash, but lots of people like it, at least the first time they visit your site.
My suggestions are:
1) If you use Flash for an intro, ALWAYS include a skip intro option.
2) If you insist on having an ALL FLASH website, ALWAYS include a non-flash, HTML version of all the important pages.
3) If you choose to use Flash for navigation buttons, always include HTML text links, on the same page, to all the same urls that the flash navigation goes to, so the site can be easily indexed by the search engines.
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Hurricane Graphics -
Custom web design, flash animation and search engine optimization