Ever since the compatibility issues with Adobe CS3 were cleared up and developers updated their applications Leopard has settled in. The much needed update of 10.5.1 helped this out as well. However there are many more hacks in terms of gui in Leopard then there ever where in Tiger. You can mod the dock like never before and even change its color. Some might say though that this is because more developers have switched to apple because of the recent magnet the iPhone. Now with around 3 and half million copies out there Leopard has officially over taken Tiger.