Ive noticed that some of the keys on my 15 powerbook (1.33) make a slight click or popping sound when I release them. Its like they are a bit sticky (no I didnt spill anything on my keyboard) and arent as consistent as the other keys. I had the keyboard replaced under warranty recently but the problem still persists which leads me to believe its a problem with the underpad or whatever its called. I phoned Apple again and they didn't really have any suggestions other than to replace the keyboard again. Personally, I don't think this will solve the problem. Just wondering if anyone else has experienced this? Its not a huge issue the keys all work okay but I expect a laptop at this price range to at least have a decent keyboard. Ive tested other PBs and they dont seem to have this problem. Maybe Im being too picky but its bugging me nevertheless. Any ideas?