UK Bump keys – Primarily aimed at Bump Key technique although not exclusively. A nice friendly atmosphere in the forum and a very helpful bunch too!
Lockpicking 101 – A well established forum with an extensive source of knowledge!
Key Picking – A very good forum with lots of topics and lots of active members.
Lock Pickology – Another good forum worth taking a look at.
Bump Key Forum – A forum all about bumpkeys.