Visual Studio 2005 product suggestion
My first item.
.net is a multilanguage environment, but Visual Studio doesn't allow developers to take full advantage of this because it doesn't provide any means of producing a single assembly from source code comprised of multiple languages. It's not so much that I want to code in different languages, although that is sometimes the case, but rather I might have existing source code in VB, and sample source in C# and a desire to integrate into a single assembly. The <Assembly:InternalsVisibleTo(...)> attribute goes a long way but single assembly deployments are often preferable.