I know it's an old phone, but it appears that certain aspects of the phone architecture make it somewhat desirable. After all, PDAJunkie said she/he just grabbed two more recently.
If I can figure out how to upgrade the ROM on my phone, I believe it will actually still be a pretty decent data phone for at least another couple of years. WM5 is so slow though, but a free PPC is certainly nothing to sneeze at!