Atlas F1 Bulletin Board: Large, active message boards on all things F1.
BBC Five Live's Motorsport Message Board: Discussion around F1 and motorsports in general.
Global F1: Discussion about Formula One's past and present.
MSN F1 Web Community: Includes discussion, chat, pictures, and a calendar.
Proboards Formula1: Discussion group debating all things F1. Analyzing past, present, teams and technology.
The Chequered Blag: Message board for F1 fans. Also includes a few videos and photos, and related links to news and team sites.