The best piece of advice in the post is to use the now free MS Virtual PC to install IE 7. Now, you might say, “Who, Wyatt! I don’t have a copy of windows to install on the VPC!” Well, there are a few options. Easy and free one is to download the trial edition of Windows Server 2003 R2.
Another, more interesting option, is to join the Microsoft Partner Program and subscribe to the Microsoft Action Pack. While $300 is folding money, it is a very, very good deal overall, considering Office Professional alone runs $500 plus.
Enjoy and happy browser compatability testing.
PS: Also, see my previous IE7 post for links to some compatibility tools.