High Priority:
--------------

Finish shared_ptr support:
    http://aspn.activestate.com/ASPN/Mail/Message/c++-sig/1456023,
    http://mail.python.org/pipermail/c++-sig/2003-April/003760.html
    http://article.gmane.org/gmane.comp.python.c%2B%2B/2847

Replace "bad argument type for builtin operation" with better error
messages.

   Implement type_info streaming for GCC
   (http://mail.python.org/pipermail/c++-sig/2002-June/001277.html)

Converter scoping: http://article.gmane.org/gmane.comp.python.c++/2044

Document builtin correspondences between builtiin Python types and C++
types

Medium Priority:
----------------

FILE* conversions: http://aspn.activestate.com/ASPN/Mail/Message/1411366

"Constructor Functors/Factory Constructors" - enabling the addition of
new construction routines which aren't in the C++ interface

Low Priority:
------------
Write "inside the Python type system", a survey of typeobject.c in
Python source

Better overload resolution - choose best match (maybe never)

Detect non-explicit constructors and automatically call
implicitly_convertible<>.