No, I don't do flash based sites or intros. The main reasons is that they are can easily be search engine invisible and they often have problems with a significant portion of the site visitors. And, for the most part, they can prove a negative to the photographer as people can say "gee wiz, what a great looking site" and be more impressed by the flash than the photography. I like simple design with easy to use menus, and clearly defined pages of photos.
I do quite a bit of PHP work, however, so if you want photos, banners, etc. to rotate on each visit, then I do that sort of thing. The campground site that I link to illustrated this sort of thing (refresh each page while looking at the graphics, ads, etc).
Keep in mind that I always have a major focus of making the site search engine friendly and developing it so it will show up on the first page of the search engines.
"The map is not the Territory"