The All in Wonder cards also allow you to input audio/video devices and record with quite exceptional quality on your computer. For example, if you have many old VHS tapes, you can easily hook up a VCR, record the videos to your computer, and burn them to DVDs.
I have both a standard 9800 Pro, and an AIW, both perform virtually the same graphics wise, the AIW is just basically a "do all" card.