Totally off topic, but I have to congratulate Jungledisk on this upgrade.  I have been using their web service for a while now, and it performs impeccably.  Result – I have a complete nightly back up of ‘my documents’ for about $15 per annum (6 gig’s including My Music 4 gigs, and files 2 gigs).  It works as an incremental back up so only takes a few minutes, scheduled at 4am.

This upgrade is amazing … the first sentence is mind blowing.

To enable fast file renaming and copying, we’ve placed servers in Amazon.com datacenters using their EC2 service. When you need to rename, move, or copy a file on your Jungle Disk a request is sent to these servers with the old and new names. The EC2 server will copy the data from the old name to the new name without the data ever leaving the Amazon data center.

This means that it not only occurs quickly, but you aren’t charged any bandwidth for the operation. The request sent from Jungle Disk to the servers is signed such that only that specific operation can be performed. In addition, the file data stays encrypted at all times during the transfer, and stays completely within Amazon’s internal network. Your secret key and encryption keys are never sent out of your machine.

Source: Jungle Disk » Blog Archive » Fast file rename and copy

Personally I advocate ignoring all this other x boxes services.  Amazon has this down to an art.  Another metric, is the pace that developers are shifting to S3 for their file storage which is exponential in growth.  Its a simple web service connection to ensure that reliability.