Will I need a Magic Trackpad to take advantage of OS X Lion? From what I have read and/or seen about OS X Lion, it sounds like many of its new features rely on gestures.  I have a Mac Pro and do not have a trackpad of any kind.  Will I need to get a Magic Trackpad to take advantage of many of the new features in OS X Lion?  What kind of user experience can I expect in Lion if I don't have one?  What will I be missing out on?
The only thing you wont be able to use, are the Multi-Touch Gestures.