Known primarily as an email alternative, YouSendIt jumped onto the cloud bandwagon with its own storage repertoire. The company's Lite version -- the freebie account -- is nothing to write home about: 2 GB maximum storage and a file cap size of 50 MB. Its Pro Plus plan promises unlimited storage for $14.99 per month and file size maxes out at 2 GB. Not surprisingly, given its legacy, YouSendIt lets you track downloads, return receipts and digital signatures. Your files are encrypted during transit and at the other end, and you can access them from your computer and your mobile devices (Android, iOS, Windows 8).