Links

BMX

Streetphire - The home of the NSF and all that is Street.
Flatland - Self explanatory.
London BMX - Does exactly what it says on the tin.
Ride Finder - Just getting started, so show your support!

SKATE 

Skate the UK - And do it all in a day.
www.eryc.co.uk
- A seriously nice site.
Skateboarding Directory
- A nice link exchange brings this one here.
Sketchy Skateboarding - dedicated to the skateboard scene in and around Stoke-on-Trent.

LITERATURE

Document Skateboarding Magazine.

BUY

Slam City - London's finest.