I use Firefox for security, features, portability, and speed. Well, they dropped IE for Mac, and there never was an IE for *NIX, so that's strike one, anyway. Although, supposedly Vista (or a flavor thereof) will natively run *NIX software, so they seem to be going back to the same philosophy they had with UNIX back in the Windows NT days. Anyway, IE 7 looks to have the security people need, BUT I have a bad feeling IE 7 security will be the same as IE 6 security, where the security is there, but any script kiddie with an internet connection can find 1024 ways to get around it. Speed is narrowing between the two, but Firefox 2.0a1 seems to be giving IE a run for its money already, and it's an alpha. IE 7 includes something similar to extensions, not including the already available tabs and VERY firefox-ish search bar, but the majority of the extensions cost, and that is stupid. Not that it would work, but still... M$ has finally gotten their game on, but it seems to be too little too late at the moment. There are too many people who don't want Vista (even if they could get it, it seems), so are stuck with IE 6, so they switch to Firefox.