From Rainer Brockerhoff, Quay is a utility to bring hierarchical folders (with distinct icons) to Leopard’s Dock. Each Quay Dock tile is a document for Quay’s helper app, which pops up the menu when you click on the document in the Dock. This clever, hack-free design has the downside that the Quay menus appear on mouse-up rather than mouse-down.
Update: Brockerhoff discusses Quay’s development.
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