Found this on the macnn forum. This terminal command allows anyone who has an older non multitouch trackpad or a mouse with a scroll wheel to access app expose in a more convenient manner. Simply scroll up on any dock icon to activate app expose.
defaults write com.apple.dock scroll-to-open -bool TRUE
This used to be in the early lion previews but was deactivated in favour of 2 finger double tap app expose (which was exclusive to multitouch trackpads).
defaults write com.apple.dock scroll-to-open -bool TRUE
This used to be in the early lion previews but was deactivated in favour of 2 finger double tap app expose (which was exclusive to multitouch trackpads).
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