This is an epically helpful tool for webdesigners, I have seen a fair few versions of it requiring sign ups but this one is the slickest and is free!
To see an example : http://browsershots.org/http://woodylabs.com/
Or stick your own url in : http://browsershots.org
I originally found this gem on Gath Adams blog so props to him!
Blogosphere posts on Browser compatibility – Screenshots from different Browsers
(Automatically generated External Blogposts of no relation to this blog)
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[...] you don’t want to use an external service to screenshot a site (see this excellent one), use firefox and use screen [...]