Short version:
The correct way in the latest versions of network manager is to mark which 
connections that should be evaluated as default connections in the connections 
editor. Marking as Fix Released. 

Long version:
To my surprise (and maybe because of bad coverage in documentation, since it 
seems many people have had this problem and fine-combed google to find a 
solution), there exists an option that solves this bug in my case, where it 
only is a problem at home when connecting to my local wireless network in order 
to share my internet connection, access printer etc (ie not connecting to the 
internet):

In network manager connections editor: Wireless -> Mark my local
connection -> Edit -> IPv4 Settings -> Routes -> Use this connection
only for resources on its network (If enabled, this connection will
never be used as the default network connection)

This is a new feature since I started experiencing this issue, so I am
marking this bug as Fix Released and instead opening up new bugs for our
improvement suggestions.

Some new bugs just reported, in order to improve network manager to be more 
intuitive and flexible on this point:
Bug #366774 - Please add new sub-menu "Set default connection" in nm-applet 
menu with the current active connections, so that default route+DNS can be 
changed easily
Bug #366777 - If the current connection provides internet access, don't change 
default connection when more device connections become active (Requires that 
bug #278488 is fixed first though)

Then, of course, some documentation / wiki entries about this would not
hurt!

** Changed in: network-manager (Ubuntu)
       Status: Triaged => Fix Released

-- 
If Ubuntu is connected to more than one network (e.g. GSM and wireless) but 
only GSM has internet access, OS is unable to access internet. NM version 0.7.
https://bugs.launchpad.net/bugs/278485
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