For general car news, then Pistonheads,
PistonHeads.com It was one of the first ever websites I looked at almost exactly 10 years ago and I now look at it once week (normally on a Thursday). I occasionally look at AutoCar and AutoExpress websites.
I read forums about the makes of car we have. Scoobynet.com as my dad has an Impreza. Briskoda (pronounced Bris-skoda)
BRISKODA.net as we have 2 Fabias. In January I became a member after lurking for a while and I am totally addicted to it. I have posted over 800 posts which is an average of over 3 posts per day so far.

I am also a member of SCN
SEAT Cupra.net as they invited Briskoda members to a Rolling Road day.
I occasionally look at TDI & TDCI forums
Turbo Diesel Owners Club UK as I nearly bought a Fiesta TDCI. I also very occasionally look at Mini2 and MX5 forums as I nearly bought one of them. I even found Austin Rover Metro Forums as I had one of them.
For Motorsport news then Ten-Tenths Forums
10 Tenths Motorsport There are sections about all forms of motor racing. I read the Marshals and Rallycross sections. I have been reading it for 6-7 years and one of these days I will join.

I have met and know many of the members and even the site owners.