Commissioning a museum computer exhibit can be a confusing business. This page has links to documents written by a range of experts. At the moment a lot of this advice is from people I know. But if you know of some other good advice on the web let me know and I'll add a link.
A great article which tells the real story behind the hi-tech Prada shop in New York. As you might expect things didn't go quite as smoothly as their PR made out. Don't let this put you off - lots of projects go very well indeed but they're not so much fun to read about.