Palma made a USB development board for the PIC18F2550. These chips are really popular, and there is a bunch of projects floating around the internet with them, even our own USB IR Toy, and USB LCD Backpack use them.
This board is basically a breakout board, with decoupling capacitors, and a USB jack. We like that all the broken-out pins are connected two 2 pins of the dual row female header, making it easier to connect one pin to a more then one external component.
You can also check out our PIC18F2550 Breakout Board, build in the “blade” style, having all the breakout pins on one side of the board.
PIC18F2550 USB development board - [Link]