I have made yet another round of little improvements to Selector.
The proposed wsgi.url_vars spec is now used. Positional args are now supported in path expressions. Some little decorators to map the args (vars, captures... whatever) from the URL to the callable's signature have been included. Naked-object and HTTP-method-to-object-method styles of dispatch are now provided for completeness. I am hoping that the slight cleverness of some of these features does not lead to their overuse, but what is one to do? Finally, selector is now LGPL.
See the Selector page for more info.