Apple announced Mac OS X Lion with considerable fanfare at its Back to the Mac event last October, and now it's dropped the first developer preview on the world -- giving us a chance to sample some of the big cat's new features and UI concepts. We installed the dev build on one of our MacBook Pros and used it over the weekend, and while we won't be able to see any huge changes in day-to-day workflow until our favorite apps are updated to take advantage of Lion, we did see plenty of interesting system-level features and additions -- and yes, iOS's influence is all over the place.Full preview after the break...