Interesting stuff here, apparently VZW is offering a trade in program so you can exchange your current device for a gift card for a new device. Incredible is worth the most currently.
Verizon Launches Trade-in Program, Incredible and Eris Worth More than DROID X? - Droid Life: A Droid Community Blog
Verizon Launches Trade-in Program, Incredible and Eris Worth More than DROID X? - Droid Life: A Droid Community Blog