This series definitely made me think long and hard about the events contained within in each episode. I really love the fact that it conveys dark (but ultimately hopeful) and complex ideas in a relatively simple and understandable way. I don't mean simple in that the messages contained are easy to follow but there is logical consistency throughout the series and that pleased me to no end.
All the interpretations here were great to read and helped me appreciate the anime even more. If nothing else, I hope this bump will get more people to watch an excellent series.
EDIT: Actually, I have a question!