OK these are fairly basic questions i think. Firstly I was considering upgrading the 2GB RAM to 4GB on my macbook, but firstly wanted someone to explain what activity monitor is telling me about my memory. There is Free, wired, active, inactive and used. I can work out what free and used mean lol, but what do the other 3 mean. Right now it says I have 9.8MB free lol, so im guessing i am in desperate need of an upgrade, or is that normal? Secondly if i am going to upgrade, can someone give me some advice on which are the best brands to get for RAM? is it simple enough to install yourself or should i take it to a apple store? OK last think was about my hard disk space. If I put my macbook to sleep witout shutting down i notice my hard disk space decreases (though it appears to recover it when i do restart it). I havent shut it down since sunday, and its gone down about 4GB!? is that normal?