Tether for BlackBerry is a very popular application that helps users tether their BlackBerry to their Mac or PC for internet access. The app works very well and has really taken off over the past year since it came out. To celebrate their birthday Tether has decided to give away 3 free BlackBerrys at www.tether.com/contest. All you have to do is sign up with your full name and email address.
There are a few caveats like the contest is only available for US and Canadian residents but you can read all the rules at: tether.com/contest-rules
Tether has also discounted their application to $29.95 until March 16th if you were planning on buying it.