I'm not out there yet [but will be April 15, woo hoo] but right now I have a work laptop, a Mac at home, and an older Compaq laptop that is mine. Besides iTunes
I don't keep much on any of the machines. I have a 1GB thumbdrive I keep what I need on.
Also, if I want a more failsafe, I send myself an email with an attachment and save important documents on gmail's server.
I am looking at getting one of the larger flash based external harddrives. And perhaps an ipod. I back up what little I keep on all three machines and I back up the flashdrive regularly.
For the penguiny lurkers, my laptop has a small Win2K slice on it [for a side job], the rest is Xubuntu, very fast and up-to-date as well. I had Slackware on it, but I didn't have time to hand dig everything. I miss it but it is gone.