Okay, did a test.  Package versions:

libnm-glib0 0.7~~svn20081015t024626-0ubuntu1
libnm-util0 0.7~~svn20081015t024626-0ubuntu1
network-manager 0.7~~svn20081015t024626-0ubuntu1
network-manager-gnome 0.7~~svn20081015t194645-0ubuntu1
network-manager-openvpn 0.7~~svn20081015t024626-0ubuntu1

After activating the tunnel (I deleted and re-created the config, so now
there's no static routes configured anymore), the routing table looks
like this:

VPN-GATEWAY via 10.0.0.1 dev wlan0  proto static
10.8.0.5 dev tun0  proto kernel  scope link  src 10.8.0.6
10.8.0.1 via 10.8.0.5 dev tun0  proto static
10.0.0.0/24 dev wlan0  proto kernel  scope link  src 10.0.0.51  metric 2
169.254.0.0/16 dev wlan0  scope link  metric 1000
default via 10.0.0.1 dev wlan0  proto static

So the default route is still pointing to the residental CPE device, and
not the OpenVPN tunnel (which would then have been "dev tun0").  In
other words, the bug is still present.  There's an improvement there,
though, the route to 10.8.0.1 is back where it should be.  resolv.conf
still looks good.

I haven't stayed on for long enough to tell if the host route to VPN-
GATEWAY will survive a DHCP lease renewal.  I'll let you know how it
goes when I return from work.

A potential interesting log snippet:

Oct 16 07:38:54 envy NetworkManager: <info>  VPN connection 'Work (added in 
GNOME)' (IP Config Get) complete.
Oct 16 07:38:54 envy NetworkManager: <WARN>  
nm_system_replace_default_ip4_route(): replace_default_ip4_route() returned 
error Success (0)
Oct 16 07:38:54 envy NetworkManager: <info>  (wlan0): writing resolv.conf to 
/sbin/resolvconf

Regards,
Tore

-- 
Intrepid regression: default route is no longer redirected over VPN tunnel, and 
DNS servers provided by VPN server not used
https://bugs.launchpad.net/bugs/269071
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