Cloud-based document storage services are a wonderful boon, and I'm a big fan of Dropbox. Any document I'm working on, I put it in my Dropbox folder. As I make changes, the most recent version of the file is automatically uploaded to the web. And because the document is in the cloud, I can access it from my iPads or from any computer connected to the Internet. The Dropbox app on my iPads lets me view most document file types. Box is yet another popular cloud storage service, and whereas Dropbox offers 5GB of storage for free, Box announced on Wednesday that for the next 30 days they're offering 50GB of free storage for life if you download the new Box for iPhone and iPad 3.0 (free).