What's the best beta? IE 8 vs Opera 9.5 vs Safari vs Firefox 3

Incidentally, did you know about the Flock browser?
Flock is a Web browser built on the Firefox codebase, and is aimed squarely at social network obsessives and YouTube devotees. It integrates loads of these sites and offers features such as friend update notifications, and the posting of blog entries without having to visit a blog's admin section.

It's very useable and rather than giving you a rundown of features, we encourage you to just have a play. It's not in beta, but it's in the early stages of its life, and new functionality is sure to happen in the not-too-distant future.

Should any of the other browsers we've looked at today integrate social sites in this way? Is it completely pointless? Or is it reasonable to use two browsers for different types of Web use? Let us know on our forums.