I just went through a three week gauntlet of interviews (~10 companies who each do at least 3 1-hour interviews). This slide set is pretty accurate in terms of what to expect but I'd weight the API's/language/philosophy sections down a bit. I only got a few language questions and absolutely none about development philosophies (except for maybe "emacs or vim?"). Algorithms & data structures are what you should be studying. Puzzles too but that's more about doing a lot -- you can't really study per se.