I've been testing my work-in-progress on as many machines as possible.
SFML (and my game on top of it) have worked flawlessly on my Windows XP laptop, my Ubuntu 10.04 (same laptop), and OS X Tiger (old PowerPC computer).
A friend of mine has a laptop with Vista, so I decided to test the game on this OS as well. It works fine, except when attempting fullscreen std::err prints "Failed to change display mode for fullscreen" and instead of fullscreen I get a window with a titlebar and no controls. This behavior occurs regardless of which VideoMode I use (typically the DesktopMode, which SFML detects correctly).
Any ideas? It's a Dell laptop with a pretty lousy Intel integrated graphics card (though my game runs fine in a window). I'd be happy to obtain any further details for you all that might be useful. Help is much appreciated!