The free service lets you hand out a public email address so that people can send things directly to your Dropbox. You can have the service automatically create folders and subfolders based on the email subject, the sender's email address, or the date the document was sent. You can also tell Send To Dropbox to unzip archived files automatically and include copies of the email messages sent.

You've probably heard that Google Docs has a built-in version-control system so that you can go back and view past versions of a collaborative document, but did you know that Dropbox and SkyDrive offer similar services?

Dropbox keeps a snapshot of every saved file over the past 30 days; if you delete an all-important paragraph and want it back, you can recover it as long as you saved a version of that file to Dropbox in the past month. Go to your Dropbox folder, select the file you want to see, and then right-click it and select View Previous Versions from the context menu. This action will take you to a Web page listing your latest file saves for that document, including the revision date and who changed the file. Dropbox typically shows only ten changes per page, so click the Older> link to see more changes from the past 30 days.