Twitter says that they are partnering with Apple to bring tweets to Apple's Spotlight search on iOS and OS X.
Update: The feature is live! You can now search Twitter @names and #hashtags right from Spotlight on iOS and OS X. Not all searches are returning results yet, but that will hopefully improve as it rolls out.
During Twitter's earnings call yesterday, CEO Dick Costello noted that the company would be partnering with Apple, bringing Tweets to Spotlight. Spotlight is Apple's built-in searching mechanism found on both iOS and OS X.