I'm just doing a simple search online and finding alot of stuff.
Socket 10/100 Ethernet CF Card
Socket In-Hand Scan Card SDIO - barcode scanner
Socket 56K Modem CF Card
Socket SDIO Wireless LAN CardSocket Bluetooth Connect Kit + Adapter
This may not count, but I thought was pretty cool... a Bluetooth Serial Port. Sheesh.
http://www.cdw.com/shop/products/def...spx?EDC=559628
CDW.com and probably Amazon.com has all this stuff.
Brian