This may have been asked before, but the closest I found was this:
http://forums.tigsource.com/index.php?topic=7257.0 which doesn't really answer the question.
After looking at a couple of flash portals, it seems like most games run in a smallish window. I can see that the portals would like this, since it lets them show ads and things; probably many players like it too, since they see the games as a light diversion and don't want them taking over the full screen.
I know that it's possible to go fullscreen in Flash 10, with some restrictions. Are there any portals which allow this? If not, what kind of resolutions are allowed? Or is that a question that doesn't even make sense in the world of flash, because of the emphasis on vector stuff?
(I've never submitted a game to a portal)