Well you know which one I’m using right now - but if you want to read a couple comparisons, try these:
- Forward Thinking by Michael J. Miller: IE7 vs. Firefox: The Competition Really Begins
- Firefox 2, Internet Explorer 7: Random Thoughts
I will eventually install IE7 - I have to if I want to see what my sites will look like - but I want to wait for a few bug fixes to be released first 
