I have written a PocketPC version of inventory software. I utilized the following: the .NET Compact Framework, both with Visual Basic .NET and Visual C#, SQL CE, and communication with a WebService. The device was also compatible with Symbol, Socket, and Intermec scanner units.
I have also written XML based batching software for a construction company.
I was also involved in writing an entire system for a manufacturing company, which included bid processing all the way to product delivery.
I also implemented a user interface for a real estate company's in-house databse.
This is only a brief summary.