To Quentin (and other new E-510 owners),
I will be very interested to read about your further experience with what seems to be the best received 4/3 camera so far. The E-510 is a big enough step forward from my E-1 that I am for the first time tempted to upgrade. For me it is "double or bust" when it comes to pixel count increases, but the greatest attractions are stabilization for the lenses I already have and LiveView for precise macro focusing.
I am waiting for details of the promised next higher end Olympus model, which I expect to have the same sensor (or one of the same pixel count but with multi-channel read-out for a higher frame rate), upgrading instead in other respects like more sophisticated AF, more rugged but heaver, two control wheels, articulated LCD, etc. So comments on image quality and best settings for JPEG conversion and such will probably apply to either option.