I'm sure many of you have heard of Dropbox, but one issue I have with them is how small they give you for free space. For me I use my online storage for lots of things, from vacation photo sharing, file backups, etc. That said I've switched to Copy.com as they give you 15GB free space if you install the desktop app (the same function as the dropbox app). Check it out - it's got all the basic features as dropbox but with more storage. Sign up if for nothing else for the free space!