In edit mode, the Mesh->Vertices->Smooth menu lists the shortcut key as "W, 0", however to use the function you have to press "W, Alt 1". "W, 0" is used to flip the normals of a faces.

This is set in /blender/src/header_view3d.c, but also appears in /blender/src/toolbox.c. In the latter there are some other incorrect key shortcut labels (e.g. Bevel, Set Smooth/Solid) as well.

Don't know whether keyboard shortcuts should remain the same, but the attached patches change the entries in the menu and toolbox.