Intelligent PDA Solutions?

Big Nothing asks: "My company is building a PDA solution for a company that makes industrial machines. Currently, all service technicians (some 1500 people) are handling the work orders and service reports by paper, and clerks are manually punching the data into the computer systems. The idea is that this that this could all be done on PDA's via GSM. When connecting to the company server, finished job reports are uploaded and new job orders are downloaded. Some time ago, I read an article in the NYTimes [free reg. required] on medical doctors using PDA's in their daily work . The impact of PDA's on various industries seems to be enormous, and I'm curious to learn about other success stories on PDA's and to hear your thoughts on possible uses of PDA's in the industry?"