Based on the technology of Adobe Air, here a small free utility that allows you to customize the interface of  Adobe Photoshop CS4, and adapt it to each user needs : Adobe Configurator 1.0.  
With a simple and intuitive interface, Configurator allows you to create your own panels of tools, integrate them to Photoshop CS4 in the Extensions menu, use them in accordance with your desires and even share them with other people (via Adobe Extension Manager CS4).

Read the whole article

Wow, great tool!

Tip for Vista users: You must run this tool as an administrator to export to the program directory (if in the Program Files area, not sure about if installed elsewhere)