The dimensions of the two are very similar, so size should not be a problem.
However, the various connectors are in slightly different places, so a case
with cutouts for the 600 might not work for the 650.
PalmOne and Treocentral have a few cases specifically for the 650.
Zane
> Will the 650 fit the 600 cases?
>
> If not, can you suggest a good case for the 650?