I've been a beta user of FireFox 4, and I can tell you that it is Tight. The fully sandboxed execution space of Chrome is desirable at times, but I couldn't work without my stable of FireFox plugins.
I can't complain about IE - between that and Microsoft patches, they the most consistent part of our managed services revenue the last 6 years. We have also gotten several new clients through eradicating network infections over the years. Most of it tracks back to poor security practices, IE [has been] the attackers tool of choice.
Regardless of your browser choice, I'll repeat my suggestion from ACUC last year, download and use XMarks - a wonderful way to have your bookmarks available to you anywhere, even accessing the list of open tabs on another machine so that you can continue reading/researching.
And yes, a few times I have looked up a bookmark on my Droid X to share a link without having to dig my laptop out. Almost *priceless*.
