http://blog.scottlowe.org/2013/04/16/openstack-summit-2013-networking-in-the-cloud-an-sdn-primer/
Furthermore, if you want to know more about what MidoNet truely is, you can check out these:
http://bradhedlund.com/2012/10/06/mind-blowing-l2-l4-network-virtualization-by-midokura-midonet/
http://blog.ioshints.info/2012/08/midokuras-midonet-layer-2-4-virtual.html

