Well actually this is for any web designer in general that does front-end development or back-end development, or both!
I just discovered this:
http://labs.adobe.com/technologies/browserlab/
…via www.surfstation.com today (one of my daily reads) and gave it a try.
Turns out it is a very powerful tool for web people. It even has onion skin much like Flash’s to view one browser on top of another to see minute differences.
Just thought I would share since it really is an invaluable resource.