Agile in game dev

This article at gamasutra is a very nice introduction to agile (specifically eXtreme Programming).

I am trying some of the techniques described there even though I'm not (professionally) working in an agile project (we're getting there...).

Some of the topics that got my attention:
Test Driven Development (I'm a sucker for this ;) )
Pair Programming (great Idea, bad for my last.fm stats ... )
Continuous Design (because it just makes sense)
...