I think I've linked to it before, but you really should spend 5 minutes at
McSweeneys every day (there's new writing on
the front page every day) It can be a bit American oriented, but it's a constant source of really great funny writing. Have a look at the (all regularly updated)
Lists,
Open Letters to People or Entities Who Are Unlikely to Respond, or the journals of
Traig and Mcgrath, Shut-in Detectives (start from Case 1). Loads more to explore.