I'm always looking to further my knowledge of photography or photoshop - I do have a good general knowledge of photoshop acquired over the years, but probably don't know any photography specific tricks or techniques. I'm looking for any seriously recommended books on learning proper techniques, not just newbie photoshop books. The same goes for photography - technically I'd say I'm pretty advanced, but want something to read to push the boundaries a bit. Does anyone have a list of recommended books or websites?