Olympus this morning took the wraps from a new entry-level digital SLR that should help it fight rivals like the Nikon D3000. The E-600 is very similar to the 12-megapixel E-620 but makes key choices to drop the price: it removes the backlighting from the buttons and scales back a handful of software features, including the aspect mask control, a double-shot exposure mode. Half the art filters h
