I've found a fix for my version of this bug. I have an ipw2200, and I used to get two simultaneous keyring prompts after logging in when nm- applet tries to automatically connect to a preferred, secure network. I installed the network-manager and network-manager-gnome 0.6.4 packages from debian unstable, and they seem to have fixed the problem.
-- Displays repeated keyring dialogs on resume from suspend and login https://launchpad.net/bugs/31286 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs