The IP2000 is a cheap chip (< $10 in quantity) for doing 802.11b. It is a general purpose RISC cpu that's fast enough to do MAC routing in software. (is that correct?) Info from picklist: http://www.piclist.com/techref/ubicom/ip2k.htm
Low cost devkit:
http://home.netcom.com/~gregor_g/ip2022isp.html
An SBC using the IP2022-160:
http://ultradense.com/product_sbc.html
Ubicom page on the IP2000:
http://www.ubicom.com/products/ip2000/ip2000_processors.html
Picture of it being used in the Slimdevices Squeezebox:
http://www.slimdevices.com/images/inside_squeezebox/
Update 12 Feb 2004:
Drat, from what one of the Squeezebox guys have said, you must buy the $15k dev tools from Ubicom to do development. And, you still gotta buy a wireless card. This is not worth it.