Are you looking for a quicklaunch for Expose on your Magic Mouse? You can give this a try (while we wait for OSX Lion).
http://clement.beffa.org/labs/projects/middleclick/
Install, then open this and bam your magic mouse can use the middle button spell.
But the problem is that the magic mouse doesnt have a middle button and hence you cannot assign it anywhere. There is only mouse button 2.
The workaround for this is to use your old usb mighty mouse. Plug it in. Disconnect from the bluetooth magic mouse.
Go to System Preferences and assign mouse button 3 to either spaces or expose its up to you.
Then reconnect to magic mouse, unplug the mighty mouse. And your good to go. ^_^
The trick is that you will need some personal training since the three finger detection is not as cool as the one Apple will provide in their next driver
TIP: while spaces/expose is on use the cool touch scroll to select what you want and then three finger tap again to exit spaces/expose with the focus on your selection.
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