[Cool Tool] Browsershots

Browsershots is a free online tool that makes screenshots of your web site in different browsers/versions on multiple platforms (Win, Mac, Linux).

Use it to test the look of your web sites :
http://browsershots.org/

Set your choices then come back later and see the results (here you can see my blog before/after the Opera fix):

On the live app you can click on a picture to get the full version.

Note: IE8 is already available, but no Silverlight yet.