I noticed over on the IE8 blog that they’re looking for beta testers:

As previously mentioned in the IE8 Beta Feedback post back in March, we have several ways to submit feedback on the IE8 Beta. Currently the only way to directly file a bug with the IE Team is to be a part of the IE8 Technical Beta program on Microsoft Connect. Beta 2 is right around the corner and we are expanding our reach! If you wish to be a part of making IE better by contributing great bug reports then please email us at IESO@microsoft.com and tell us a little about yourself including why you’d be a great beta tester.
We look forward to hearing from you,
Allison Burnett
Program Manager
A great opportunity to help shape the product – and from what I’ve seen so far you’ll be part of a really great beta test phase…
nod to CC for the links…