Data is stored in MongoDB, and assets are packaged with JAMMIT. Two tornado apps run each of backlift.com and backliftapp.com behind NGINX.

Using bare PyMongo, asyncmongo, or some ORM-like solution?

Coincidentally, I'm also working on my own app using Tornado and Backbone and considering the switch to Mongo (currently using the base MySQLdb wrapper included with Tornado) - curious as to how you've found working with whatever Mongo solution you're using.

Edit: Initially forgot to include asyncmongo in that list.