I think that one of the most difficult things about Linux is that there are just so many distros. Linux is not a single entity, but represents many distributions, and in my mind, this has always been both a selling point (customization, choice) and a great disadvantage (confusion) when it comes to Linux adoption. An article at Slashdot reports TipMonkies’ Guide to Linux for Beginners. This is a good, comprehensive guide to Linux distros. I have a fair bit of experience in this area, but still, the guide was helpful to me in clarifying areas of vagueness. If you are interested in Linux at any level, this is a worthwhile article which will aid your knowledge of this important, but very misunderstood operating system.