Anyone ever seen this? Looked pretty cool. It takes a ton of things into account. Don't know how accurate it really is, and I'm sure some people won't like it because ultimately it's still an estimate, but it's worth looking at, at least:
Metabolism Forecaster
Another thread on the topic (also links to the 2nd, newer, thread):
http://forum.bodybuilding.com/showth...hp?t=114980801