Utah County is definitely the center of the Utah tech boom. Between UVU and BYU there are lots of small college-fueled startups in Orem/Provo, and many more mature companies formerly based in SLC are moving farther south, at least to Draper/SoJo if not over the point of the mountain.
This move has been underway at least since the mid-oughts, but it has accelerated lately after Adobe's investment in the Thanksgiving Point area and as Utah County's outskirts (Eagle Mountain and Saratoga Springs) have started to recover from the mortgage crash.
I'm more concerned about SLC's long-term prospects at this point; no one seems to want to go further north than 7200 S anymore.