Just installed SL this morning from Tiger and the problems just keep coming. Numerous crashes with systems preference and now serious heat issues. If I use stacks for 10 seconds the temperature will increase from 55C to nearly 70C.........I used to be able to play WoW under tiger for hours at a time so I don't get why using stacks spikes me so much. This is on a Ati X1600, so I'm going to think twice before installing SL into my integrated graphics white MB....... Now the heat has gone from heat to whenever it reaches 76-77C the wifi just completely drops out. I am using the newer extreme wifi card so it's been amazing with tiger but with SL it's a mess. I'm guessing the heat just kills the card, I've got to admit I've never hit 76+C on Tiger so I don't know if it's entirely SL's fault. This is a huge problem since I play WoW and if the Wifi drops in the middle of something.......sigh I'm so disappointed.