Microsoft have released two free books on Visual Basic .Net in PDF format.
"Get a focused, first look at the features and capabilities in Microsoft Visual Basic 2005, Visual Studio 2005, and the .NET Framework 2.0. If you currently work with Visual Basic 6, these authors fully understand the adoption and code migration issues you'll encounter. They'll step you through a quick primer on .NET Framework programming, offering guidance for a productive transition. If you already work with .NET, you'll jump directly into what's new, learning how to extend your existing skills. From the innovations in rapid application development, debugging, and deployment, to new data access, desktop, and Web programming capabilities, you get the insights and code walkthroughs you need to be productive right away. "
"Upgrading Microsoft Visual Basic 6.0 to Microsoft Visual Basic .NET is the complete technical guide to upgrading Visual Basic 6 applications to Visual Basic .NET, covering all upgrade topics from APIs to ZOrders. It shows how to fix upgrade issues with forms, language, data access, and COM+ Services, and how to upgrade applications with XML Web services, ADO.NET, and .NET remoting. It also provides big-picture architectural advice, a reference of function and object model changes, hundreds of before-and-after code samples, and a CD packed with useful examples."