WPMU.org is one of the biggest directory for premium WordPress MU plugins. Their annual membership costs almost 419$ and to celebrate the launch of 100th plugin, WPMU.org is giving away 3 free license of yearly subscription.
This is an easy contest and any one can participate into this. All you need to do is write a blog post about this contest on your blog and link it to 100 plugin giveaway.
If you run a WordPress MU site, you will love to grab this opportunity to access all the premium plugins for your blog.
You can read more about this contest on their official announcement page.
Do let us know which wordpress set up you are running? WordPress MU or stand-alone wordpress? Just for the info: WpVeda is running on WordPress Mu.