I ended up buying one and it works under debian (zubuntu) with the 2.6.23 kernel, so I assume it will work under Angstrom as well. Search for "SOCKET ETHERNET CF CARD" on Ebay and it is the all in one version that does not have a dongle. It is recognized as NEC2000 and so now I have 10/100 network card for $34 including shipping. I think he has like 30 left. One bad thing is it is very long and and makes typing pretty interesting, but oh well.
James