Pycon 2013 was excellent, in fact it was my first one I have attended.
I found it odd that django and Pyramid had plenty of talks but nobody mentioned tornado.
The only person that brought up tornado was Guido himself, who has been researching and developing async python since December 12th, 2012. Guido wants to add async API libraries to python core, and has been comparing his work to twisted and more importantly tornado. He is leveraging the existing solutions to stay on the correct track.
Async API's in Python core! This news was extra exciting for me, because I have already learned the power of async by messing around with tornado. Since the talk many people have approached me and asked for more information about async API's.
My favorite use for async is long polling for web applications. Here is a diagram that shows how great tornado is:
This type of polling can support thousands of concurrent users, all connected and waiting for a callback event to occur. I used tornado to build four2go, a real-time and multi-player browser-based-game.
You should check out my latest project, Remarkbox. It's a comment system that works everywhere, even static sites!