Mac OS X Leopard: Your Favorite Feature Poll

Apple (AAPL) will release its new operating system upgrade, code named Leopard on October 26. The $129 upgrade is packed with 300 features, including some new ones. My personal favorite, and the only real reason to upgrade is the new Apple Mail client. What is that one good reason to upgrade (if you upgrade) to Leopard? Take our poll below the fold.