Please note that this page is no where near complete. I will add to it regularly.... The star (tyre!) rating is basically what I thought of the site - content, design, speed etc. and it's out of five.
General F1 sites
Atlas F1 - A general F1 magazine site, with a very comprehensive and up-to-date news section. The articles, written both before and after a race are also well written and informative. A site note afraid to criticise when criticism's due. It's also quite quick to load, and not overburdened with adverts.
Gale Force F1 - Bills itself as 'the fastest results service on the Internet'. And it is. It's where Atlas get their qualifying and result information from, and it is very comprehensive. If you want the results, this is the site to go, and it presents them in a variety of formats. Granted, the 3D VRML model is pretty much useless, but it is quite cool that you can move it and around :) Not quite as cleanly presented as Atlas, but an essential site nonetheless.
MNI F1 Links - A nice links page, although there's only minimal descriptions of any of the sites they link to. Still, you get most drivers and teams under the sun, including past and present.
Teams
Ferrari - This is Ferrari's main company website, not just the F1 team. You have to trawl through quite a few pages before actually getting to stuff on the GP team, but then 'trawling' the Ferrari site is not like trawling most pages. Graphically impressive, slick but a bit slow. Good Java headlines for F1 news, but otherwise it's a bit light on content at the moment - there's only two pictures to download!!
Benetton - In Japan :0 so, it takes a while to load up.
Jordan - Usual GP fair, pictures, news, biographies, but also a bit different, it being Jordan. Had quite an amusing article on it about Ralf Schumacher's new personal sponsors...! Oh, also has a novel section about how to get jobs with F1 teams and stuff. Quick, as its not overloaded with graphics.