Never done it, but I guess I would not do so, at least not at the present moment... I believe that few people have nice computers that run flash sites nicely, so I'd stick with conventional sites.
I'd only promote a flash website if I knew my traffic has flash in their computers. A script could do this detection and send the surfers to the flash site, or to some conventional site if the visitor doesn't have it installed, but it's way too much work! lol
Just my 2 cents
Take care,
Bruno
PS: if you try it, let me know how it goes for ya!