I bought this case a week ago:

Nexus One Candy Skin Case - Clear

A couple of things about it:

  • There is extra cover around the camera lens. It interferes when taking pictures with the flash, so I cut it out.
  • The hole for the charger/data cable is too small for the charger. I had to cut out some of the plastic to get it to fit.

This was the only clear, flexible, rubber case I could find.