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This script will create a window containing every poly smooth node in the scene. The first tab in the window contains sliders to control the number of divisions in each smooth node, after this tab are tabs for each node. Each tab contains every attribute in the smooth node. Based on the version of Maya you are using the window will add options for the appropriate attributes. For example in 4.5 the smooth UV options will not appear, however in 5.0 and higher they will. You do not need to tell the window what version of Maya you are using; it will figure it out for itself.
1.5 - Tabs and sliders are now named based on the object not the smooth node, and the "Smooth Divisions" tab is now a scroll layout allowing the interface to remain small but still contain multiple nodes. I have also included a shelf button.