Like Olivier Bornet I found the same kernel-related nm-applet bug. (Gnome nm-applet 0.6.3)
When running 2.6.20-6 on edgy, network-manager works perfectly on my IBM T43p (with atheros), including WPA.
When running 2.6.20-12/13 on edgy, network-manager stops working at all - but I can get an IP-address using dhclient and at least eth0-connection works fine.
So there must be some kind of change in a module from 2.6.20-6 to 12, which conflicts with nm-applet.
Like Olivier Bornet I found the same kernel-related nm-applet bug. (Gnome nm-applet 0.6.3)
When running 2.6.20-6 on edgy, network-manager works perfectly on my IBM T43p (with atheros), including WPA.
When running 2.6.20-12/13 on edgy, network-manager stops working at all - but I can get an IP-address using dhclient and at least eth0-connection works fine.
So there must be some kind of change in a module from 2.6.20-6 to 12, which conflicts with nm-applet.