I have the grandaddy of all Macbooks - a 1.83 Core Duo - that I've been ignoring for some time. But recently, I decided to extend its life a bit by upgrading to an SSD (a great decision BTW). The MB still serves my needs well, but there's one thing that bothers me -- the noisy fan during high CPU loads. I've been monitoring when the fan kicks in and it's usually related to Flash or app installs, which is all to be expected. The thing is, I've had this thing since '06 and it just seems more noisy than before. However, its also possible that I just forgot what the noise level was really like. The noise at full RPMs doesn't sound like a noisy fan really, more like a blower. It's definitely annoying while watching flash videos. I actually ordered a new $6 replacement fan from eBay, but I'm not sure I want to open the case again if my existing fan is fine.