Parasitic, I have EVDO and use an MSI Dual Net card to share internet. I think I got it for about $30, but they're no longer made, and seem to be going for $40-50 now. It comes with software that allows you to run as a software access point in Windows XP, and I use ICS to tie my EVDO modem to this software AP.
Probably depends on where you live, but my EVDO is pretty kick ass. Typical speeds are between 1-1.2Mbps, but on good days I can see over 1.5Mbps. Yesterday I was downloading from Megaupload at about 225KBps (1.8Mbps). Not bad for $25/mo.
Of course, this is from a second-story floor, and I am not too far (3-5 mi I believe) from the tower. Also, latency is high (about 300ms average), that's just an inherent flaw of EVDO rev.0 unfortunately. Makes it useless for low-latency stuff (gaming, VoIP, etc.).