For the advanced users amongst us (and those that don't mind quirky software). Get it from here. Note: If it does something bad, I'm not responsible.
See also: Al's Quick IE7 Preview 2 FAQ.
I tried to use IE-7 beta 2, but had a big problem. For some reason the log-in window of McAfee's Pricacy Service had no data in it. It was a blank window with just the title bar. I could not access the internet because the privacy service had no place to enter the password. Also, the system restore would not work from help and support window, however I was able to retore system by going to list all programs and activing the program that way.
Hi William - thanks for mentioning the problem with the McAfee Privacy Service.
I looked in the IE feedback newsgroup, and it looks like it's a known problem.
How to get feedback to the IE Team:
The McAfee security centre problem:
(short version: we're working on it).