Hi Everyone, Being fairly new to the digital music world, I have decided to finally buy a used iPod (can't afford a new one at the moment). I noticed there are quite a few 2nd gen. and 3rd gen. models on sale on eBay. What are the main differences between the 2nd gen. and 3rd gen. models? (Besides the obvious faceplace change). Does, say, a 10 GB 3rd gen. model really boast significant improvements over a 10 GB 2nd gen. model, and if so, what? Are they the same physical size? I have even heard somewhere that in some ways the 2nd gen. models are better (perhaps better battery life?)... Any comments? Thanks.