If you go to http://dagobah.biz/flash/ and scroll down and press a random flash it opens in a new window with ads on the top and the side, still the page say ".swf" not .php or so on, how did the manage to get those ads in there ??
The flash is embedded inside a table. The ads are in a <tr><td>... Probably that the .swf is not really a .swf. If I have to guess I would say they are using mod rewrite to pretend the file is a .swf...