Site suggestion - Build Tracking
I was thinking that it would be beneficial to be able to keep a list of other peoples Instructables that I have built. Sometimes I forget what all I have made and like to look back over them. Since I have built projects using existing Instructables I don't want to duplicate them by writing up my own of the same thing.
It would be neat if there was a "I've built this" button or check box on each instructable, maybe in the comments section or something. Then not only could I look in my profile and see what I've made, but could look at an instructable and see who/or how many people have made it. As an author it would be cool to see that someone has successfully built something I came up with.