Hmmm...
I don't wanna buy the Seagate and then find out I can't use it bec I have to pay to access pogoplug.
I'm not techie, I never hack or jailbreak anything at all so I don't know about that even if Seagate can be use by a different OS all the terms just go over my head.
Well, Holiday season are near so I expect there will be lots of deals pretty soon. Hopefully I'll be able to get a pogoplug below $50. I can still wait....In the meantime, Dropbox works for now.
daffy4u, Timmy_B and karthwyne for answering my q's.