An Heirloom by any other name is actually a different thing
Our own Laura Hess, former Lazarus Fellow for the YSFP, just wrote an article for Grist on mislabeling amidst heirloom tomato varieties. Some guy tried to disagree with her on the comments, and got totally smacked down. Awesome. Link after the jump, as well as a photo of a tomato that looks like Mickey Mouse.