I've been using passenger's wsgi support for close to two years. (I transitioned from ruby to python for web dev so it's no surprise that I stayed with what I knew best). I would love to see Mono support as it is in desperate need of a good webserver - especially now since the ASP.NET stack was open sourced.

Python most definitely.

We posted our passenger+python announcements on the Python reddit before, but we didn't get much attention for it. Do you know in what way we could really address the Python webdevelopment community?

post benchmarks cause the python community love those, and make it work nicely with gevent. Just make a little hello world Flask app and show us how it performs.

I use Passenger for my Ruby projects, but use nginx with gunicorn for Python - no reason behind that choice whatsoever except that is the stack that I found nice blog articles on how to get working with gevent

C# via Mono sounds very interesting :) would make deployments much easier

Haskell would be killer.

At Rackspace, we use Node.JS and Python out of those.

For playframework apps?