I've had my Macbook pro for a while now and there has been one thing that kept bothering me. Whenever I use something cpu/graphic intensive, the temp shoots up and stays up. Normally I would idle at around 36C, but after I use youtube or play any game, the temps would stay at around 55C even after exiting all the programs and is at 99% idle. It's fine when I'm plugged in, but when I'm using my battery, I only get about 2.5 hours with the brightness on very low and wifi/bt off. Checking the stats on iStat, the battery is using 19Watts at idle. I've tried restarting / cold boot but it it still stays high. The only way to get the temps back low is to reset the PRAM. But once I use any application besides TextEdit, the temps just shoot back up and stay that way. It gets annoying to reset my PRAM each time I want to use my battery for an extended amount of time. I took it to the Apple store and all they did was give me a replacement battery which didn't fix anything. I've tried 10.5 and 10.6 and happens on both. I really have no idea what is going on.