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NetworkManager is getting support for bridging. It is not yet in the master branch (as of 2012-06-14) and it doesn't yet work for me (pavlix) but I believe it's time to have some testing configuration to work with. It may not work for you, so feel free to modify this page when bridging support is generally available.
The 'keyfile' way
Bridge:
[connection] id=Bridge uuid=fc61f6e5-8900-4c6f-915c-eb55714eb874 type=bridge [bridge] interface-name=wan2
Slave:
[connection] id=Slave uuid=2e1906b1-92a4-4206-b2d3-eecfd07241e9 type=802-3-ethernet [802-3-ethernet] mac-address=52:54:00:8e:93:da slave-type=bridge master=Bridge
The 'ifcfg' way
ifcfg-Bridge:
UUID=fc61f6e5-8900-4c6f-915c-eb55714eb874 TYPE=bridge DEVICE=wan3
ifcfg-Slave:
UUID=2e1906b1-92a4-4206-b2d3-eecfd07241e9 TYPE=Ethernet HWADDR=52:54:00:8e:93:da BRIDGE=wan3