Rick, I don't really know a list. The book Gaia's Garden has some really nice tables in which they list "weeds" and other plants, along with their benefits. I think an online list like you're describing would be an extremely useful resource. Maybe one day we'll organize an effort and make it happen.
hazelnut: I know what you mean about a sharp shovel. I have an expensive shovel that is made out of all steel (including the handle) and I love it, and keep it sharp exactly the same way you do.
