http://www.forestofavon.org.uk/out-and-about/cycle-routes/timberland-trail

http://www.bikely.com

An online database of downloadable cycle routes, including mountain bike routes in the Bristol area.

http://www.bristolmountainbikeclub.co.uk/

One of a couple of clubs active in the Bristol area. They run regular rides (including girls only outings), away trips and there's also a classifieds forum. Membership is the princely sum of £5 a year.

http://www.1sw.org.uk/

A new initiative, spearheaded by the Forestry Commission in conjunction with local partners, that aims to develop the South West as a destination for off-road cycling. The project includes a plan to turn Bristol into a regional mountain biking centre, with work on the ground starting in 2011.

http://www.imba.org.uk/

The UK arm of the International Mountain Biking Association. Loads of info on trail construction, rights of way, land management and what's happening with trail development around the country. Also check out their US site at http://www.imba.com for heaps of info on trail construction, techniques and design.

http://savestillwoods.blogspot.com/

See here for more information on the campaign to re-open Still Woods as a DH venue.