Take a Look at WSGI Load Balancing

Jim Fulton is gracious enough to give a sneak peak of his upcoming Pycon talk. When a web application is large, it's a good idea to send different kinds of requests to different servers to reduce the content corpus managed by each server. A decentralized load balancing-based approach is presented in which each application server keeps track of what it's good at and presents its resume to load balancers, which use application server resumes to distribute load.