I started hacking a bit on ColdSync, setting up Plucker with it and getting the mail to work on my Palm. I think that I'll have to write a conduit for both of these.
plucker-build doesn't update PDB files, it just overwrite them, and since the version on the Palm and the one on my workstation are the same number, the new one is not uploaded. So I think I'll have a fetch conduit that will modify the existing PDB instead.
For the mail, ColdSync just has a conduit for sending mail. I'll have to make another fetch conduit to gather mail from my IMAP account(s). I find it nice that the two sides (send/receive) can be separate like that.
But at the moment, I am currently hacking on an Advogato conduit (I wrote this entry on my Palm)