Lion's out and there's a lot of new stuff to explore. Apple tells you about most of it on their web site, but there are still some secret features you'll want to know about. Here's a look at our top 10 favorites. 10. Add New, High-Quality Text-to-Speech VoicesOver the years, Apple's been working incrementally to improve the quality of the text-to-speech voices offered with its operating system. Fo