I've setup a samba PDC with roaming profiles on my laptop. The profile is about 600MB, but using the tricks listed on this page, my profile is about 28MB now... it's not too bad, considering what I started out with and the ntuser.dat file being 21MB. I still need to tweak each application to make sure that each program saves to the "Application Data" directory. I'll do it even if I have to email the authors of each utlity/application. :) I'll try to write up my experiences and current setup. I'm pretty excited because now my personal data, resources, projects are consolidated on my linux box and my windows(future macs) will have access to them transparently.