Actually, one can create perl applications for the PalmOS, in fact there are many modules on CPAN that relate to that area:
.. Just to name a few. I'm not quite sure when or if one will be able to install and actually code on the PalmPilot or PalmOS. Then again, with the changing of technology and the advancement of both the language and the hardware - who knows, the future may not be that far away.
Update: fpi and
dvergin made excellent points, I had not looked closely enough. Erf, that's what I get for being tired and responding too soon. :)