Olympus' E-PL1 is a camera on a mission -- it not only shrinks the entry-level price tag for Micro Four Thirds cameras to $600, it retains the same 12.3 megapixel sensor, image processor, autofocus and metering systems of its elder, the E-P1, while introducing its own advantages that even the pricier E-P2 doesn't offer (hello, integrated flash!). With a 720p movie m
