Yesterday while sitting in a talk about getting into embedded systems by monitoring the output buses, the wifi flaked out. It has been coming and going all the time.
Fortunately, we had a 3G cdma phone w/ 1xRTT. A 15 minutes of putting stuff together, dnsmasq, the iptables config from my home server, and some tinkering with iwconfig, we had a ad-hoc network with Internet access.
At the high point we had 4 people connected via my computer. 1xRTT is not good for sharing, as no one really had good performance. But it was fun. Fun is good.