Verizon is hiding certificates for 16 Droid Charge Smartphones in different sites across the US. They will be giving out clues to the locations via their website and Twitter. This hunt will only last from April 21 to May 4.

Twitter

https://www.chargelanding.com/

Droid Landing Updated, We’re Looking For Droid Charges

They had a similar promotion a few months ago. That one ended up being more of a race than a hunt, because the exact coordinates of the certificates were posted as the final clues for each city. Not sure if this new contest will be the same or not.