IBM is giving away for free, copies of Cloud for Dummies, a book sanctioned/sponsored/written/whatever-ed by it. You can either ask for a hard copy, which will probably take time to arrive if at all, or you can choose the e-book option and download the 75-odd page book instantly. I preferred the latter, the tree hugger that I am [not, nevertheless].
A quick look through the book evoked a fair bit of interest. It is, as the front page indicates, targeted towards mid-sized enterprises who could leverage the benefits of Cloud-based services & storage for their benefit.
A cloud service that I find immensely useful would be Dropbox. Complete integration with Windows Explorer means I can upload to the cloud by simply copy-pasting within the windows environment itself.
I even tried syncing content between two [or more] Dropbox accounts. It worked perfectly, though I don't use it in this configuration.
You could sign up for Dropbox using this link [referral]. You sign up for an awesome service, while I get some 256 MB of free additional space.
To order your copy of Cloud for Dummies, you need to enter your details here. Fill it up with garbage data, if you are choosing the e-book option.
Godspeed