I'm with the others. I am seriously considering micro 4/3's equipment purely from the point of the weight of the kit. My wife and I recently spent 4 enjoyable days looking round "the stately homes of England" and although I pared the kit in the bag to the minimum, after walking round all day, it felt pretty heavy! I am seriously considering the Olympus PEN series. Reviews look good and as said above, you can get into the system at entry level and upgrade without having to change all (or some) of your lenses. Most of mine are DX lenses and the cost would be totally prohibitive - for me - to say nothing of the additional weight and loss of "crop factor".