OK, after a few days of use, here are some "wishlist" items that I have for the E-P1 to make it even better...
Make the "green square" mode (one of the live-view modes when you cycle through the info button) available as an overlay onto any of the other modes. In other words, make the green square (ability to magnify the center to assist in manual focusing) a toggle, rather than a separate mode.
Provide an easy way to turn off the LCD when in shooting mode. This would be especially useful when using an external view finder. No need to have the LCD displaying the preview image, wasting battery and potentially drawing unwanted attention, when your looking through the viewfinder.
Have a couple of "memorized settings" positions on the top dial. For example, "Custom 1", and "Custom 2". So that I could set up the camera with a particular combination of settings, and then easily choose that set by turning the top dial. The current "preset" functionality is too burried, and non intuitive to use.
Have the "wheel" (around the "OK" button) be used to quickly fast forward through the stored images when in playback mode (similar to the M8).
Have a "my menu settings" page within the menu, where you could store your most frequently accessed menu settings at the top menu level, without having to dig through all the menu pages to find them. The latest Canon bodies (Digit IV) have this capability.
Use the latest "top of the line" high res LCDs that Canon and Nikon are using. They are brighter and nicer to view. The E-P1 LCD is still too easily washed out in bright light, even when set to the brightest setting.
An optional thicker grip would be nice. I would like the grip to be just a tad beefier, for better one-handed use.
Some of those "wish list" items could be done in firmware. Others would be targeted for the next-gen body.
Overall, I'm very happy with the E-P1, despite these "areas for improvement", and am quite pleased to have this as my new main compliment to my 5D II system. I definitely prefer the E-P1 over the G1 - the ergonics and overall system are more to my style of shooting, and feel very good in the hand. The G1 always felt too much like a "super zoom digicam" to me, while the E-P1 feels like a little brother to the M8.
Eventually, we need a solution to the view finder problem. Perhaps and optional electronic VF that could be plugged into the hotshoe? Then it could be removed for times when space is more important, or when you want to use and optical VF (instead of an electronic VF).
Mike