My observation is that while there are plenty of startups - helped by Joshua Baer's Capital Factory and Techstars - it seems that most of the big tech companies are more taking advantage of the state's business-friendly tax laws and cheaper labor force than anything.
A lot of companies - Apple, Oracle, etc - are more using it as a customer service and sales team base than for engineering, R&D, etc.
Of course there will be plenty of counter-examples (HomeAway, Dell, BazaarVoice, RetailMeNot, Indeed), but that's just a macro observation to keep in mind.