I recently found a very cool service called Wuala which is a cloud backup/sync solution. I think it is really cool because it gives you 5GB free storage initially and all files are fully encrypted on your computer before they go to the cloud. I've been testing it for a while and I think I'm going to give it a try at some of my clients too. It allows you to share a folder with someone dynamically. Very cool! Check it out.www.wuala.com