A good ground/air support attack is to be ready to attack with Dark Templars and Corssairs. First, use Corssairs to web Siege Tanks, Sunken Colonies, Spore Colonies, Photon Cannons, or any basic ground defense. Next, you come in with your Dark Templar and start destroying as many units as possible. Next, you come in with Reavers and Dragoons when your Templar start dying out. When all of your units die (which they probably will) come in with Archons and Scouts and finish the job.
Here's a tip for you, do not make lots of Corssairs, they only attack air and it's only 5-damage unless you really know how to use them for support.
If you have any great Protoss strategies, email me and I will post your strategy on my page with your name giving you credit.
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