Dockprefs is a free dockling that gives quick access to all preference panes that the user has access to, including custom preference panes. A custom menu of preference panes can also be built easily.
What's new in Dockprefs X
Version 1.4.3 updated to not show a warning under Jaguar (10.2/10.2.1). Recompiled with gcc 3.1. Dockprefs will not show preference panes that are not available under some systems (Bluetooth, Ink). Fixed some bugs and streamlined code.