I've just come across a great looking cloud storage service called Copy.
Seems to be a great alternative to Google Drive and Dropbox, given they have much more generous storage (15GB free, 5GB for signing up via referral, 5GB for referring, and paid storage starting at 250GB at $10/month).
Clients are available for Windows, Mac, Linux, iPhone and Android, with Windows Mobile coming soon.
Sharing options are pretty good, including the ability to 'split-the-bill' on shared folders, and the ability to easily give access to photo albums. There is also no limit on individual file sizes, unlike the majority of other free storage services.
Link: http://copy.com
Affiliate Link: https://copy.com/?r=mNNILW (this gives both you and me a bonus 5GB once you install one of the clients)
Mod please delete if I've broken any rules
Trend Micro said the app contained malware