Rayqual has new line of adapters that will be compatible with the upcoming Sony NEX-3 and NEX-5 cameras. These adapters will let you use Nikon, Canon FD, Pentax and Leica lenses on either Sony camera. Pretty sweet huh? The cameras are good looking too.
These modern lenses were specially designed for crop sensors, with minimal changes made to the focal length since the NEX series ocameras ship with APS-C sized sensors. This should give you some cool lens options.