Just played a game of SC2, 1v1.
Guy cannon rushes, I keep him out of my base. He tries to hem me in with cannons, I get a few siege tanks and knock it down. Meanwhile, I build an ebay and another CC. Load two SCVs. Fly it over to his natural expo. Land it. He builds 3 pylons around it as I start to turn it into a PFort. Pylons come in about 55%, he builds a few cannons around it. Cannons come in just as it's finished upgrading. Repair, attack pylons, build two turrets. Void ray comes over before the second turret is done. The few SCVs get it done, build two more turrets. He gg's.
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http://www.youtube.com/watch?v=qSOC87NkmXc