For sure there are more options in the Nikon and Canon system for lenses, and everything else.
Not being a professional photographer, I did go the Micro 4/3 route with the Panasonic Lumix GF1. I got it with the 20mm lens. With this system, the lens is closer to the sensor, so a 20mm lens is more like the 40mm of standard SLR. I added the 40 macro, and the sweet 7-14 wideangle. I got one zoom (14-140) for the occasions that I am not close enough, although I am blown away at the non-flash pictures you can take with the 20mm 1.7 main lens.
The sensor in the micro 4/3 system is head and shoulders above the point and shoot cameras (I have Canon 8 megapixel something or ever that I loved until I saw these pictures), at 12 megapixels and RAW files, its amazing what you can do.
Not that the image quality is not there with the other DSLRs, I just prefer the smallness of the micro 4/3. I was looking at the Leica cameras. The nice digital camera BODY is only $7K, so I moved on quickly.
Edited by Bones13 - 5/8/10 at 6:09pm