I first found Diego Goldberg's "The Arrow of Time" a few years ago whilst surfing the net. It seemed like such a simple idea, one of those "now why diddnt i think of that?" moments.
The idea is that ever year since 1976 the Goldberg family take head shot of themselves, alway on June the 17th, always with the same pose and expression. Its oddly compelling watching the family change. Diego himself hardly changes at all but his wifes hair flares around depending on fashion, his children also change rapidly as they grow older.
Goldberg maintains a page for the project at zero zero magazine