I handle the IT for our small, family owned solar business. I/we have been using Street Atlas for about 15 years at home, and I've used it for nav for about 6-7 years now.
We have now started trying Street Atlas 2009+ XData for mapping our customers. We currently have our customer file in an MS SQL database, which I imported into an XData dataset.
What a wonderful tool. Over the 35 years in business, we have about 2600 customers in the NY/NJ/PA area and keeping track of them (from a geographic standpoint) was getting difficult. It is wonderful to lookup a last name in XData and jump to that customer's house right on the map, on the laptop, in the truck, if we need to go out for a repair or other service visit. We are running this on an Acer Aspire One netbook, so it makes an incredibly powerful and compact tool, so much better than the 300 page printed lists and then trying to find the address on the Delorme NJ Gazeteer and Atlas.
We also have started using it as a sales tool... when we are seeing a prospective customer, we can go right to their zipcode and they can visually see other customers in the area that have solar energy systems installed, and we can pull names and phone numbers for references right on the spot. This has had an incredible "wow" factor with people we see.
I can only see use making better use of this technology in the future. Being in a service industry, we spend all our time going to houses, and time spent looking for something is money lost. We can respond to calls on the fly, and even in some cases call in and get messages while on the freeway, only to realize that we will be driving right past someone's house.