Sharp Zaurus PI-3000, Apple Newton MessagePad 100, Sharp Zaurus MI-10DC, Sharp Zaurus MI-E1, Sharp Zaurus MI-C1-S, Sharp Zaurus SL-5000D (first Linux-based Zaurus), Sharp Zaurus SL-A300, Sharp Zaurus SL-C700, SL-C860, Nokia 6630, Nokia 6680, Nokia 770, Nokia N800, NintendoDS Lite, Nokia N70, iPod Touch 16GB, Nokia N810.

Best user interface is probably the Newton MessagePad although if "data detectors" makes it into the iPod Touch OS it'll be close.