How does Fluther show users responding in real-time? Is it Ajax?

Django, i believe.

I was going to guess Javascript, but I’m probably wrong.

It’s technically AHAH. We rewrote the whole presence framework recently to use memcached instead of the database since we were getting isolation level discrepencies due to the large number of writes. No more flickering!

Yeah! What Andrew said ! :p

iirc, fluther uses: http://developer.yahoo.com/yui/

Fluther actually wrote about his topic on their blog a little while back.

http://blog.fluther.com/blog/2008/04/02/howd-they-do-that-real-time-chat/

It gives a general overview of how they do it.

A very interesting read.