It’s been a while since an entirely new niche of digital camera has come along, but with the release of the Olympus E-P1 and the Panasonic DMC-GF1, that’s what we have. These “Micro Four Thirds” cameras represent the first significantly new class of camera since, possibly, Canon’s D30 SLR in 2000. With their small size, interchangeable lenses, and sensors that are larger than what you’ll find in a point-and-shoot, they offer a new option for SLR shooters who want a smaller second camera, but don’t want to give up too much image quality. Conversely, for point-and-shooters who are ready to move on, but don’t want to hassle with the weight of an SLR, a Micro Four Thirds camera might be just the ticket. But which of these two cameras is right for you?