For the next 50 days, Box.net will give you 50 GB free when you sign into the Box.net iOS app. And that’s “completely free, forever.” If you’ve got an iPhone or iPad, do it right now, because that’s a great deal. To put it in perspective, a free Dropbox account comes with 2 GB free, and an iCloud account comes with just 5 GB.

Box.net is document storage in the cloud. It allows you to upload and download files as easily as you move them in and out of folders on your computer (yes, you can drag and drop to your browser). There’s even a free add-on app that lets you integrate Box.net into Microsoft Office.

It is also built for sharing. Box.net would be a great way to share files with co-counsel or clients, because they don’t need to have special software to use it.

Most small firms won’t need more storage than 50 GB. I’ve only got about 16 GB in my Dropbox account, and that includes 7 years of client files.

In other words, this is a Great Deal. Sign up now.

(Hat tip to Engadget!)