Tether is one of the most popular apps for BlackBerry, and I can say it's one I have used in the past with great success. Tether is an application that allows your PC to take advantage of your Blackberry's data plan, allowing you to access the Internet on your laptop anywhere there is cellular coverage from your BlackBerry. It doesn't come without a cost though, as most good things don't. If you've been waiting for Tether to go on sale before you buy, this is your lucky break! You can pick up Tether for BlackBerry (or for Android, for you bi-mobile types) for half off, bringing the price down to $24.99 for a limited time.
On top of this sale, Tether is giving away a BlackBerry Playbook! To enter all you need to do is: 1) Leave a review of Tether on BlackBerry AppWorld, either good or bad. 2) Give them your email and username to enter into the drawing. Easy peasy! Please note, the PlayBook contest is all Tether, CrackBerry is just helping spread the word. Leaving a comment here will not enter you in the contest, nor will it increase your chances of winning.