Yeah, that's the guy - he was one of the "founding fathers" of the sport. Some of the pics I've seen are menthol with people doing roof-gaps over 80ft drops and stuff. Scary.
Actually, there's a good sort of one in the videos section of TonyHawksProSkater 4. Check out the Bam Margera vid to see him jumping between two pick-up trucks at what looks to be about 60mph. The man is a loon.
Subway-surfing I think it's called? Lots of taggers do it, and splat themselves in the process. Probably great fun until you don't see that bridge coming up....