Both TurboGears and Django are excellent. Furthermore, each has strengths for different kinds of projects, with TurboGears at its best for web applications and Django for big, industrial strength web content sites.
Twisted and Zope are great too, but for most developers, Django or TurboGears is going to suit them best. Both are under rapid, well coordinated development and are proven solutions that will scale well over time.
TurboGears' best of breed component approach is, in my opinion, a winning strategy, especially in the Python community since Python is blessed with so many great projects (some people think too many projects), giving a plethora of high quality, well maintained and best of breed components for TurboGears to choose amongst.
There are multiple good tutorials on both frameworks here, http://www.awaretek.com/plf.html
, as well as related podcast material about TurboGears and related Python material.