Handly little OSX tip from TUAW; quickly scroll through your files, folders, and applications from a single popup icon on the Dock.

Drag a folder (or your hard drive icon) to the dock, place it on the right side of the vertical line (near the trash). Now when you click and hold, or CTRL+click that icon, you get a popup menu much like Windows start menu. This allows you to quickly navigate your filesystem. An old tip perhaps, but a good one.

A variation on this and other tips available here.