One of the Python GSoC projects this year is a Python 3to2 tool that lets you convert Python 3.0 code to work on 2.x. Once this is implemented, the major projects (like Django) can switch over to 3.0 without having to put work into 2.x branches, and that should provide critical mass for normal developers to switch over too.

Here's the proposal: http://socghop.appspot.com/student_project/show/google/gsoc2...