Thanks for the quick reply.
I am running gnome.
As per your instructions, I removed network manager and the gnome front-end, rebooted, installed knetworkmanager, and rebooted again. (I don't know if the reboots were strictly necessary but thought they couldn't hurt.) Anyway, it didn't solve my problem.
In fact, knetworkmanager doesn't seem to detect my system properly. It says no devices detected and the addresses, statistics, and network tabs are grayed-out. I tried to configure it but the settings seemed to be limited. In short, I couldn't get it to do anything.
On the bright side, I was able to go to system->administration->network and select my "home-wireless" location and establish a network connection so it didn't seem to break anything.
I'm not sure what to do next. Is there something I missed with knetworkmanager? Why do I need these network managers (kde or gnome)? They don't seem to be adding any functionality.