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I'm holding out for a version that lets me use two-finger scrolling.

Three finger scrolling works on a mac (Lion). I think you can enable drag lock on snow leopard for the same effect.

EDIT: The mouse does move off the view port during drag, so its probably not that much more efficient.

In Lion, I'm pretty sure this only works if you enable "Three Finger Drag" in the trackpad settings.

Look at the Trackpad page in System Preferences. There's a reason why it's called "Three finger drag" instead of "Three finger scroll". :)