Please could someone point me in the direction of a good explanation of all the different versions Linux/x-windows/desktop GUIs/apps? I'm thinking of running Linux on my apple Powerbook G4 550 but I'm confused by all the possible permutations and how they interact. All the pages I've found seem to assume some prior knowledge. I've used DOS, back in the days of win 3.1, and have a good general understanding of computer concepts (pre-emptive multi-tasking, 3D rendering, html etc) but have no experience specifically with Linux. I also have some other questions I'd like to ask peoples advice on, but I'd like to have a better understanding of the basics first.