MacWorld loves the Fujitsu ScanSnap.
It really does sound like a great product. Fujitsu has long been a dominant player in the low end of the document scanner marketplace (low end in this market was $1000 and up -- please don't mention HP's combo shred and scan devices to me), now they've taken their expertise down below $400. (That price includes the full version of Acrobat 7.)
Years ago I kludged together a scan to pdf solution for a software product I worked on. It didn't get to market, but it was the right way to go. Now ScanSnap and others are doing it right. Adobe has had a great solution for document scanning, but they've been reluctant to cannibalize their high end sales. I hope we'll see more of that at the low end.
It's all about the paper feeder. Fujitsu knows how to do this. I've seen their real SOHO scanner ($1000) scan in a thick plastic card. Very nice device.