A service called BrowserShots that allows you to test any website in 3 browsers we have (IE6, IE7, FireFox) launched a new technology preview service here http://v03.browsershots.org/

In short - it allows you get quality screenshots taken with almost any browser possible - linux versions, mobile versions, pda and so on, very impressive list of browsers I haven’t even heard of. Feel free to check it out, really amazing.