Ah, they grow up so fast, don't they? Epocrates, the mobile drug reference software developer that claims more than 900,000 users, is 10 years old. The San Mateo, Calif.-based company reached this milestone last Thursday. "We founded the company 10 years ago with a simple goal: to improve the quality of patient care through the power of mobile devices," President and co-founder Jeff Tangney says. If you're in Silicon Valley, stop by Epocrates' headquarters Wednesday evening for a celebration. Press release