'Self Image', and 'Giga Tribe'

Self Image

SelfImage is a hard drive imaging utility for Windows. SelfImage is capable of making an image file of a hard disk or hard disk partition, and can restore an image back to any drive or partition that doesn't have open files. This is useful for making backups. Unlike dd for Windows (or cygwin), SelfImage is capable of creating an image of a partition that is currently in use. Go to Downloads section in order to download SelfImage.

http://selfimage.excelcia.org/

Giga Tribe

Giga Tribe lets you share entire folders with friends in a private peer to peer environment. Share all your files (home movies, pictures, documents, etc) no matter how large they are. It's secure, encrypted... and free!

http://www.gigatribe.com/tour/accueil.php