I have the E-P1 with kit lens, and the AF/MF mode works well with the auto zoom mode for focusing (after you AF, you turn the focus ring and the camera switches to zoom to aid focusing)
Most of the adapters seem to be mechanical only, so I guess you'll need to manually set the aperture (camera and lens), and the MF will be without the focus aids.
Will be interested to hear how you get on with MF and LV. I know the Oly screen is lower resolution than the GF1, so maybe the GF1 will make things easier, but MF on the Oly without the zoom focus aid will be very hit and miss (and I wonder whether this is actually usable). I did see the review of the Leica adapter for the GF1 on LL, but they seem to think it was far from ideal for everyday use.
And obviously interested in the adapters and how they all work etc. My statements above are just 'best guess' and I've decided not to go for an adapter at the moment because of these issues. Was just going to wait and see what becomes available.
Anyone know if the adapters are just mechanical or are some of them a little more intelligent?