I recently bought an Olympus E-P1. For those who missed this new development, the camera has a Micro Four Thirds mount. Currently only Olympus and Panasonic make them. These cameras are basically DSLRs without a mirror, with the LCD display used for shooting (like in most Point and Shoot cameras). The Micro 4/3 cameras have a very short flange back length (AKA back focus or registration) - around 20mm. This allows use of Leica mount lenses (both thread and M mounts, with back focus of 28.8mm and 27.8mm respectively).
Of course, there are many adapters available now for such application. There are some limitations, of course - the camera has to be used in fully manual mode, and because a small sensor the crop factor is 2x. I.e a 50mm Jupiter-8 lens works like a 100mm lens. Also, lenses with protruding elements, like J-12 and Russar, can not be used.
But still, I started shooting with the J-8 and I like the results. I'll post some pictures later, but the hardware pictures are below.
The Olympus E-P1 mount.

http://www.ussrphoto.com/UserContent/25122009_e-p1mount.jpg
With the Micro 4/3 to Leica M adapter.

http://www.ussrphoto.com/UserContent/25122009_e-p1_m.jpg
Leica M to 39mm adapter added.

http://www.ussrphoto.com/UserContent/25122009_e-p1_m_39.jpg
And - voilą!! A Jupiter-3 is ready.

http://www.ussrphoto.com/UserContent/25122009_e-p1_j3.jpg
This is Orion-15

http://www.ussrphoto.com/UserContent/25122009_e-p1_o15.jpg
And my current working setup - a black Jupiter-8.

http://www.ussrphoto.com/UserContent/25122009_e-p1_j8.jpg
As a side note - I do not work for or sell Olympus or Panasonic cameras.