Just found this while flipping through an OS X hack book, published by the same fine folks as Geek My Ride. Apparently, aside from mouse buttons, active screen corners, and function keys, there is another, hidden method for activating Expose, called the blob. You won't find it in any menues, but two quick lines of code in Terminal will bring the little guy up. It's basically just a round, opaque blue button (perfect for a TS) that appears on the desktop (and can be placed anywhere AND reskinned!), and serves the same purpose as the F9 default Expose action. Not such a huge deal, unless you are running VPC with no keyboard or mouse, like me. Once VPC got into full screen mode, I used to have no way to get back to OS X without a physical keyboard or mouse, since the touchscreen doesn't do active corners. But this little blob stays on top of the VPC window, even in full screen. Fixed the whole issue! I'll put up a screenshot when I get a chance, and if anybody is interested in the code or more details, feel free to ask.
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Great utility for Touchscreen Expose use