I have been underwhelmed with the main features of Leopard (Time Machine drive can't be boot disk, Stacks doesn't work well for folders with more than a handful of files, does anyone really use Spaces). On the other hand, the little features are wonderful time savers. QuickView is worth its weight in gold, I love the file name change default to everything before the .xxx, and not having to select the iDisk before accessing its content is wonderful. These little features make Leopard well worth the money.