This script takes your selected mesh and writes it as an OBJ with textures to a temp directory and then opens the OBJ in Photoshop. Since Photoshop CS3 and above have support for painting 3D meshes and can show UVs in its texture windows, this is a quick way to make a texture without having to fire up ZBrush or Mudbox, which are overkill for some simple texturing tasks. Watch the vimeo link to see the workflow. Works with Maya's Lambert/Blinn/Phong materials. 

Added better naming of objects:

http://www.youtube.com/watch?v=rBpvZB1g-mo