The Python Reference Manual (info file python-ref)
talks a lot about new-style classes, but does
not say what they are, except in a brief note
buried in node 'Coercion rules'.  The library
reference does say that object() creates such
classes, that too lacks a way to look up
'new-style classes' and find object().

Also, since 'object' is a type, it seems strange
that the Library Reference has it in the
'Built-in Functions' node instead of a node
about (callable) types.  The same applies to
several other types.  If you want to keep them
there, at least add index entries for them in
the Class-Exception-Object Index.

This refers to the doc in info-2.3.3.tar.bz2
from <http://docs.python.org/download.html>.