The point to this is to hand out a gmail invite to the person who completes a challenge you set. The challenge may involve finding some obscure tid-bit on a website to posting a picture with Kerry holding some corn. Anyone can post a challenge. The idea is similar to gmail swap, but I don't get anything in return. (Also feel free to put a link in your signature).
Here's one from me:
In the game ArmageddonMUD
which race primarily speaks Allundean? First person to answer gets a free invite. If you put up an answer provide your e-mail address (although feel free to disguise it such as having lysm@___h__o__t__m__ail.com delete the _).