Yes the IE7 is much more better than IE6. It has tabs etc.
But I use FF2 (Firefox 2), it is very secure, and has a lot of functions, you can change skins, manage security settings.
And the good thing is "Erorr log" (Tools -> Errors Console), if some page won't load up correctly - you can view the log, and see if the problem is in your browser or website etc.
FF2 is loading pages much faster for me! And less crashes happen, it is realy annoying when you write a one-page message, and then the browser crashes! :))