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Browserling is a new cross browser testing web application built with stackVM. They run IE 5.5, 6, 7, 8, 9, FireFox, Opera, and Safari instances on their servers, and you can use these browsers remotely through a virtual machine inside Google Chrome on your local machine. So unlike browsershots.org (which is free or something for-pay like LitmusApp) which just sends you back screenshots of your specified web page as seen in different browsers, Browserling actually lets you interact with the web page. But...
I haven't been able to get it to work. Or, rather, it works, but it shows me a random page rather than the one I request. So not very useful on that count. Hopefully they get it worked out because this would be a really great tool.