I just wanted to let you know that this SD / SDHC card PCMCIA adapter worked for me under WinCE 3.0 and NetBSD on the Jornada 720. Please see link below. No driver needed.
Don't think I've ever seen a PCMCIA-to-SD adapter before. With that size you'd think they'd've come up with one that could accommodate more than one SD card at a time.