I am thinking of an "infinite" disk customer product. The customer would buy a large (say 1 TB) network disk device (Linksys NSLU2 or similar) with USB/Ethernet interfaces, serving CIFS/Samba an maybe some other file protocols for users who know nothing of Plan 9.
The disk device would run Plan9/Fossil. Somewhere on the Internet, a Venti service would be offered for a reasonable monthly fee. When the user fills his 1 TB, it becomes just a cache for the Venti server, so that user's most recently used 1 TB of data is always available locally, but the logical disk size is infinite, backed up by Venti, and the archives are also kept forever, as long as you pay few dollars a month...? Note that two typical customers could share 90% of the scores/blocks, if they have roughly the same software (Windows, Office, Mozilla.org stuff) installed on their machines. If remote access speed is a problem, you could set up regional Venti servers, and just market the device regionally. Anyway, I bet 99,99% of users don't access more than couple of gigabytes of data in a small time window. And there could be some simple mechanism to mark that 10 year old movie directory for prefetching, if you know you need to watch them tomorrow.
