I got my 2.4 Alu Unibody macbook in December 2008. I've been using it quite a lot. Recently I am a getting the spinning beach ball a lot, sometimes just opening a new tab in safari (no flash). I also noticed the battery health has dropped to 96% after being over 100% for all these months. I do regularly calibrate as well. Does anyone else have any issues with these machines going slower than they were? Any ideas how to fix it?? I was going to upgrade to 4gb ram but it's nearly £100 and I just paid that to upgrade my imac.