Tue, 2008-05-06 03:32
http://www.my-debugbar.com/wiki/IETester/HomePage
Tests IE5.5, 6, 7 & 8 beta. Just downloaded it and had a quick look and it seems to work as intended. Probably too early for there to be much feedback about how faithfully it simulates the different versions.
Tue, 2008-05-06 11:49
#1
Interesting
The idea is great, but it appears to have a lot of bugs and problems. I'm just reading the forum for it at the moment:
http://www.my-debugbar.com/forum/f12-IETester-Bugs-Problems.html
Still, it could also save a lot of time and actually looks quite nice! Here's to hoping he succeeds in his attempts to fix it 
Tue, 2008-05-06 14:02
#2
I couldn't see any
I couldn't see any indication of how it works. Without that, how can you be sure it is implementing the particular version's rendering and javascript engines?
It does seems to have some other useful features, similar to Firebug.