I have been able to duplicate this issue. 
eee-pc 1000
Ubuntu 8.04 LTS with Gnome Desktop [eee-ubuntu] Now know as "easy cheesy" ack!
Network Manager 0.6.6-0ubuntu5.8.04.1
Network Manager gnome 0.6.6-0ubuntu3

I have used nm-applet on my eee-1000 for the past 6 months with out an
issue. Network Manager was always set to roaming during that time and I
had never used the Network Manager interface until a couple days ago.
Was at work and required setting up eth0 to a static IP to jump on our
private network, so I opened Network Manager and decided to create a
"default" profile with everything set to roaming, then went on to turn
off the wifi to save battery, setup a static IP on eth0 and saved it to
a profile name that I could associate with the location. When I switched
back to the default profile, I get the same error and nm-applet seems to
not be able to see any APs, just manual setting is available. While set
to my work profile, messages show up in dmesg that would have lead me to
think the driver had failed to load. A bit more digging and I knew
something else was the problem.

After deleting the profiles in Network Manager and rebooting, I could again see 
wireless AP in nm-applet but not connect.
When I setup my wireless in network manager, it provides a drop down of all the 
available access points, selecting mine I still have to enter the wpa key 
instead of it going to the keyring like I assume it should (don't know as I 
have never used the Network Manager gui before). Switching to roaming I still 
get errors that it can't retrieve a key using nm-applet. If I enter the Network 
Key in the Network Manager gui, it picks up the network fine with manual 
config. If I set it to Roaming again, it does not retrieve the Network Key from 
the keyring.

The key for me to reproduce:
Save a profile in Network Manager with the wifi turned off.
Turn the wifi back on and the only option nm-applet will give is Manual 
configuration.
Remove all Profiles in Network Manager and reboot.
You can now see APs but network key is not retrieved from keyring. Only manual 
wifi config works.

I have not found the fix yet but hopefully this helps and the attached
log of the whole process will light a bulb.


** Attachment added: "Tail of logs, and dmesg"
   http://launchpadlibrarian.net/22576059/nm.log

-- 
NetworkManager: <WARN>  nm_dbus_get_network_data_cb(): message arguments were 
invalid (could not deserialize wireless network security information.
https://bugs.launchpad.net/bugs/205964
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