PC-Ephone is another contender …
Although this article headlines is not correct, the product is looking very good. This product does not contain a CDPD modem, but has a Compact Flash slot which will accept one. It is, however, a CDMA Cell Phone and WinCE device. The feature set looks very good and this is another target of my adventures at Comdex!

Wireless Handheld Nears Market. WinCE device has built-in CDPD modem [allNetDevices Wireless News]