A new plugin is available for exporting the selected geometry's UV map to a .BMP file.
http://supercoldmilk.com/ac3dplug/exportuv.html
Sorry, this is Windows-only at the moment, and I have no immediate plans to support file formats outside of BMP files.
Good for texture templates / painting textures that conform to your geometry. This is an alternative to using the "Copy to clipboard" function of the TCE, as it creates a more precisely-sized image, plus you can create images larger than your screen resolution.
Note that this only copies the UV's, not the texture map itself, and UV's outside of the 0-1 range are not exported.
Dennis