Blending the best of OS X and iOS makes both operating systems better. Apple surprised the tech world last week by pulling the curtain back on its latest desktop/laptop operating system: OS X Mountain Lion. The final version will be released this summer, but the developer preview unveiled on Thursday shows that the upcoming OS picks up where OS X 10.7 — code-named Lion — left off. The coming update incorporates even more popular features from iOS, the software which runs the iPhone, iPad and iPod touch.