I can’t imagine anyone still tests for versions of IE any older than IE6, and as much IE6 does suck, we do still have to test in it. And if you primarily work on a Mac, that can be rough.
Well, a co-worker recently turned me on to IEs4OSX, which allows you to install multiple versions of IE on a Mac!
So, rejoice mac-ites! :-)
Happy testing,
Atg