Please describe the problem:
When I change the default route manually on the command-line, NetworkManager doesn't notice this and change the UI accordingly. I change the default route manually because NM chooses the wrong one:

http://bugzilla.gnome.org/show_bug.cgi?id=589040

Before I change the default route from wired to wireless, NM shows the wired connection and afterwards it does the same. NM should listen to the kernel's (Linux/etc) network events, notice when things change and update the UI accordingly. NM should work well with the rest of the stack, notice when things are changing and accept that it is part of a larger ecosystem and that user requirements are varied.

The architecture of netconf allows this, you might want to re-architect to match that a bit closer:

http://netconf.alioth.debian.org/

Steps to reproduce:
1. Connect to wireless
2. Plugin a network cable
3. Switch the default route manually
4. Notice NM doesn't listen to Linux kernel network events (ip monitor)

Actual results:
Status icon stays as the wired icon

Expected results:
Status icon switches to wireless icon

Does this happen every time?
Yes

Other information:
Debian squeeze with NM 0.7.1