A nice guy on the forum steered me toward the Saleae Logic Probe. Now after being thoroughly happy with mine in every respect ... they go on sale . This is a really great tool to use. It can even decode UART, I2C, CAN, SPI, and a few others. Really nice GUI as well, that lets you zoom the area you want quickly.

Microchip has these for 20% off for the rest of this month. They are well worth full price. Here is the link for Microchip http://www.microchipdirect.com/Produ...words=TSAL0001 20% discount available with coupon code TPZD4K6 (expires 5/31/11)

Video of the device in use: http://www.saleae.com/logic/videos/