The killer application for Dropbox
What the review didn't mention about Dropbox was that every change you make to any file is retained for two weeks (free version) or indefinitely (paid-for version config option). So if you delete a file by accident, or corrupt it, you can go to the Dropbox web site, log in, and reinstate the version you wanted. This has saved my bacon on more than one occasion. I now have two businesses that rely upon Dropbox - if they went bust, we'd be scrabbling for a replacement. It's reliable, decently priced, and I can't recommend it highly enough.