Holy cow the PSU Sustainanomics over on my links list has all kinds of cool stuff on it! The accompanying blog has some really great tools that they talk about, like the Consumer Consequences Game. It takes the information you input and tells you how many "earths" it would take if everyone lived the way that you do. Lots of categories, suggestions and facts. It would take 3.1 earths if everyone lived like I do. My eating habits did me in (looking at the tags on my pants, I'm not surprised!). Try it out.