Oh man, you absolutely made my day. I've been teaching my fiancee bits of Python for the past couple days (her first code ever!) and this library made it all make sense. It let her take all the little concepts I taught her, and put them together to make something cool. She just wrote a street with houses on it, generated by a simple for loop!
The freely available online book Think Python is a fantastic introduction to both CS and Python and includes a chapter on turtle graphics with some fun exercises.
We played with it with my son and it brought back memories from the 80s when the French government made a big push on Logo in the schools.