Here is a picture of my Rev 2 beta board that Byon sent me a while back. I actually built two of these, the first was Rev 1. After working out some bugs and adding some additional hardware features, you have the current version.
Above is my original PeekPack. This is what the PICPAC stemmed from. The PeekPack had one function, get the packet and display it.
The PICPAC is really a complete re-think of the original PeekPack. The PICPAC has complete on-board ability to encode and decode complete APRS packets. It has a 4 line x 16 character LCD to display more data then the orginal unit. It even has a "dumb terminal" type of function that will listen for serial data on the serial port side and display it on the LCD.