The site/blog below is running a giveaway for MacKeeper.

Code:
http://www.makeuseof.com/giveaway/
Ever feel your Mac starting to slowly bog down? Losing hard disk space but don’t know why? These are just a few issues that every computer user has to deal with. Luckily for Mac users, there are a couple very useful apps which help keep your Macs healthy. MacKeeper is one of them.
This giveaway begins now and will end on Friday, 16th May at 0900hrs PST. In order to qualify for a license, register for an account with MacKeeper. The winners will be selected at random, announced via email and their accounts will be activated for with a full license.