Oh sure, you probably don't care but I do because some of my code is in there.

This release was a couple years in the making. It is Open Source so this was all volunteer time. There aren't exact figures but hundreds of people contributed with a couple dozen of those investing significant amounts of time (I only spent 10 days on it in those two years). The largest employer of those volunteers is Google who released their python based App Engine earlier this year [which isn't python 3.0 compatible, ha!]