I too am sticking with IE. Not for all the reasons in the article by Peter (referenced below by Patrick), but because I am well aware tabbed browsing is not secure, and that the FireFox effort does not proactively patch their browser. I like how Microsoft’s reputation is on the line if a vulnerability is discovered. Does it hurt them when one is found? Sure, but it’s fixed pretty quit.
Update 12/21: WOW... I didn't realize simply linking to another post was going to generate such comments! I'm not slamming FireFox... in fact I did use it for a little while. As for the tabbed-browsing being insecure, I had read that one tabbed instance could access another tabbed instance... so a HTTP site could access what you're sending an HTTPS site. Maybe the article I read was wrong.
Update 12/21 #2: Comments are now closed. I'm not going to put up with flammers swearing just because I stated an opinion that I prefered IE over FireFox and finding different ways to get curse words in their comments. Looks like Peter has moderated comments... and is letting most of them through.