I started learning NLP sometime ago using NLTK library. As I am .NET developer then decided to develop my own wrapper for most common features of NLTK, using IronPython+C#.
Let me introduce this project to you called
NltkNet. There is also explanation of how to setup all stuff to make NLTK work in Visual Studio environment and .NET applications.
I'll appreciate any comments, addtitions and feedback from you. Project constantly evolved.
Thanks,
Denis K.