I bought my first mac ever off ebay. Its an older model imac 20 eyesight with 2gb ram, 250 hd, and 2.16 GHz Intel Core 2 Duo processor. First off is there anything I need to know. It came with Leopard 10.5.5 installed and so far ive downloaded 10.5.6, 10.5.7, and running 10.5.8 and the new sarfari for leopard. 1. First question is could i install snow leopard on it? not sure about wanting to go to lion yet, really dont know the difference since this is only my 3rd day on a mac. but i know i need snow leopard for app store. 2. It says i have 160GB left, where can i go to see whats taking up so much memory? Since i installed 3 updates for leopard are all them still taking up space of when i installed the newer one does the older one get deleted? i do have 24 movies on it. 3. I have a netbook that is synced to my ipad 2 and iphone 4. how can i transfer my itunes library without an external hard drive. i think this is all for now. i can say that im very impressed by the mac operating system being a first time user.