The german company Novoflex already produce a really long adapter list and now they are ready to release following NEW adapters:
From end of April 2009:
MFT/OM for Olympus OM
From end of May 2009:
With stop-down function at the adapter!!!!!!!
MFT/MIN-AF for Sony/Minolta-AF
MFT/NIK for Nikon
MFT/PENT for Pentax