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.