Nikola is very similar to Jekyll or nanoc. Everything is declarative, you're limited to the features implementented in the generator (and to the features that are documented). That's really not the same thing than the quick&dirty, code-what-you-need approach of PyGreen.

agreed nikola is pretty sweet. I had to write my own because I was bored. it's a good intermediate level exercise that everyone should do at least once. Like phpers writing template engines. :)

From first glance this appears much better than Pelican...