Looking to add even more retro flavor to your Olumpus E-P1? Then you might want to consider taking after Flickr user Lok Cheung, who was inspired by the Rolleiflex TLR to create this Rollei EVF (of sorts) for the Micro Four Thirds camera. While the setup isn't actually anything more than a viewfinder for viewing the screen, Lok nontheless says the resuls are "really good," with the viewfinder resting almost right behind the lens, and the manual focus "almost as fast as you can get on a true manual camera." Not the most practical camera mod, perhaps, but certainly one of the more interesting ones.
