10 Tenths, Axis of Oversteer and videos
Internet is full of information and one of the forums has lots of history, news and information on motorsport. Please take a look at 10 Tenths Motorsport and its forums.
There is lots of sub-forums and especially interesting is the car and racing history from 60s, 70s and 80s.
I also recommend to read excellent Axis of Oversteer blog, whose author seems to find very interesting information and links to hot motorsport topics.
Most are familiar with YouTube, but have you ever visited vimeo.com, which brands itself has video-site for high quality videos. Take a look at gt4zone@vimeo, which has old racing videos.