APLNext has released VisualAPL for VS2008, a dynamically-typed, array-based, object-oriented programming language to exploit the combined power of APL and Microsoft Visual Studio 2008 on the .NET platform. VisualAPL lets domain experts rapidly build sophisticated application systems, is fully compliant with ISO/IEC 13751 (the international standard for APL array-based languages), and is integrated with Microsoft Visual Studio 2008.
Also included in the VisualAPL product installation is the Cielo Explorer which provides a visual, immediate-mode, interactive session to explore C#, .Net, and VisualAPL.
You can download a full-featured, evaluation version of VisualAPL here.