In other words surround the main flash elements "which are completely useless as far as
SEO is concerned" with as much textual content as the page/design would esthetically allow. Bare in mind also, if you have a flash element used as the forefront of a marketing awareness/campaign then this is never going to see light on ANY search engine unless the page also conveys the point in textual content.
Personally, I've never used flash other than for commercial banners and the odd animation, it's of no use on it's own in tandem with a project requiring any amount of
SEO - unless you add textual content along with it.
Hope this helps.