In reply to Tob:
Hi mate, the extremekanal wont tell you anything, ots an advert for there DVD wich will be out in a couple of weeks, featuring some bouldering from there.
The bouldering is shit hot out there, the locals are friendly and will show you good circuits
This link will give you a good idea of the climbing
http://www.zawn1.co.uk/world/madrid/Patones/index.htm
This link is a fatasttic link
http://www.geocities.com/bloquecabrera/
This is all the circuits just north again, one of the better bouldering areas, and only about 45 mins drive from madrid.
you do have to watch out there, a lot of the bouldering and climbing is on private land, so cosult local climbers if you are unsure.
There is a guide book for sale in the climbing shop at madrid.
Also if you get in touch with
http://www.escuelasdeescalada.com here are all the climbing topos you will need, but no bouldering
there is a magazine in spanish that did a 112 page spread on the bouldering out there, and is fantastic, you can order it below, its a back issue that was produced about 12 months ago, beware it will take about 2 months to arrive here
http://www.desnivel.es/revistas/escalar/object.php?o=9215
hope this is some help to you, if you need more info drop me an email, will help you out
neil