Airport Express first thoughts

We got our Airport Express boxes yesterday and I finally got a chance to turn them up this morning. So far, I've installed one (and did some network reconfiguration at the same time to increase security). The device works beautifully and has a frightening range. Right now I'm sitting in the far corner of the house upstairs and I'm still getting better signal from the Express in the living room (bathroom and bedroom walls in between) than from the Extreme in the office (which has an external antenna on it and is separated by a floor and 2 walls. More news as it happens and we try the audio stuff.