If you do not have the resources to get a testing room furnished with at least 10 computers http://www.spoon.net/Browsers is the best alternative!
For people who just want to see screenshots of their site in different browsers for a cross-browser test, there are several multi-browser screenshot services available. Smashingmagazine.com tested most multi-browser screenshot services and wrote a in depth report about it. The table below is the outcome of their test.
|Browsers supported||Price (1 year)|
|BrowserShots||IE, Firefox, Chrome, Opera, Safari, Dilo, SeaMonkey, Minefield, Epiphany, Flock, Galeon, Konqueror, K-Meleon, Avant, Netscape, Shireteko, Kazehakase, Iceweasel||Free|
|BrowserCam||IE, Firefox, Chrome, Opera, Safari, Konqueror, Camino, Netscape, AOL||$999.95|
|BrowserLab||IE, Firefox, Chrome and Safari||Free (till end of 2010)|
|SuperPreview||IE, Firefox and Safari||$149|
|BrowserSeal||IE, Firefox, Chrome, Opera and Safari||$49|
|Litmus||IE, Firefox, Chrome, Opera, Safari, Flock, Camino, SeaMonkey, Netscape||$588|
|Multi Browser Viewer||IE, Firefox, Chrome, Opera, Safari, Flock, SeaMonkey, Netscape, K-Meleon, Camino, Konqueror, Epiphany, Kazehakase||$129.95|
|Browsera||IE, Firefox, Safari||$588|