I have a working Zaurus C1000 handheld from 2005. This had a color screen and keyboard that ran Linux. WiFi was on a CF card. Was a complete 486 PC. It was sold in Japan only, but a German company translated the GUI interface to English. It was a clam shell device that had a screen that would rotate and fold over itself to be a true pocket PC.
The OmniOne is a type of tablet with a keyboard and is intended for a variety of different applications. However, there are certain limitations that potential buyers should be aware of before committing to a purchase.