FolderShare from Windows Live

checkout

www.foldershare.com

for a fine peer-to-peer file sharing service. You can share folders and have users access them as either readers or contributors (can add new files), editors (can edit/delete files) or senior editors (can edit/delete files and invite other people to the account)

 

very cool for collaborating over a project’s files too (max 2GB limit per file)