In reply to Mark Wyndham Brightwell:
Barcelona's best (IMO) dedicated bouldering gym is called DeuDits
http://deudits.blogspot.com.es/
There is also good bouldering section at Climbat Magnesi
http://www.climbat.com/v_portal/apartados/apartado.asp?te=671
There is some good real bouldering to be had around the city, but you need a car. Can Boquet is pleasant enough but there is no decent guide and it is hard to find. Savassona is an hour to north and is a really wonderful spot. Sant Joan de Vilatorrada is an hour to the west and is also very good. Both these latter two are detailed in the e-bloc bouldering guide (and elsewhere). Have fun!