The new Doxie. Doesn't require a computer at all to scan. Can fit it in some pockets. Scans to an SD card. iOS connection kit coming out, and an Android app can't be far behind (for devices that have USB ports).

That's what I'm getting next and it'll be my most used scanner for typical documents and receipts.

Unfortunately it's missing WiFi, otherwise it would be an "11/10" - you have to dock it via USB to unload the scanned images. Or pull the SD card and stick that into another device.