One Finger Snap is a Preference Pane that brings up the contextual menu whenever you click and hold down the mouse button. This means that you can do everything with a single-button mouse that you can do with a 2-button mouse.
Don't throw away that 1-button mouse.
Don't carry around a clunky mouse with your powerbook.
Don't think that you've lost a second mouse button when you switch from that other OS.
Just click and hold wherever you would normally right-click.One download link is for the preference pane itself, the other is for the source.