Jornada is the name of a pocket-pc series produced by HP.
There are projects that have managed installing Linux on the Jornada (mainly the Jornada 680 - 720), but the biggest site for Jornada Linux is JLime.Com
The Jornada 680 - 720 offers PCMCIA, CompactFlash, Smartcard. The 720 also has a 56k modem built in. It can run the Linux/GNU OS.