online there's browserling and browsershots.Also Netrenderer is not bad.These are mostly free. You can install VirtualBox if you're on Linux and want to test fo

online there's browserling and browsershots.Also Netrenderer is not bad.These are mostly free. You can install VirtualBox if you're on Linux and want to test for IE and not use Wine.And Microsoft has virtual machines, I forget the name,but you can install different versions of IE on the same machine(here: http://www.microsoft.com/download/en/details.aspx?id=11575 http://www.microsoft.com/download/en/details.aspx?id=11575). You can also use the Opera mobile emulator to test for different devices.