My current (soon to be ex) company is one of the talkers. We claim to be "using some elements of XP". Fact is we have a 4 week cycle of hacking with a little bit of JUnit thrown in. No pair programming, limited planning, lots of worked weekends (not me - but the masses for sure).
Going to start a new project at a new company in a month. Looking forward to giving it a more complete try.