I bought my powerbook in september of '04. It was 1.33 Ghz, 12". At first, it felt as if the fan never turned on, and kept cool. But in the last 6 to 8 months, it has been getting really hot, and loud. Though it never overheats, it still becomes very hot, loud, and slows down. Maybe it is just mine, or I leave it on for too long. Thats just what I have noticed.