AspView is an ASP/PHP like view engine for MonoRail*. It uses the <% ... %> syntax for scripting.
This view engine is specially designed to work within Visual Studio 2005, and supply the view coder with the best development experience, including Intellisense and compile-time checking.
AspView is designed to work in a PreCompiled manner. That means that on a production server you'd need not deploy the view sources, but only a pre-compiled dll file, containing all the views needed to run the site.

Although AspView is currently not part of the core Castle release, it is compliant with the major features of the builtin MonoRail view engines, and support Layouts, Sub-Views, View-Components and Helpers. In addition, it also offer a feature called "ViewFilters" which allow for easy string transformations on selected chunks of a view.

* If you are not familiar with MonoRail - go and read about it at Castle Project website. In short - it is powerful MVC Framework for ASP.NET.