Python and .NET integration

I'm currently looking at python because I really like the text parsing capabilities and the nltk library, but traditionally I am a .Net/C# programmer. I don't think IronPython is an integration point for me because I am using NLTK and presumably would need a port of that library to the CLR. I've looked a little at Python for .NET and was wondering if this was a good place to start. Is there a way to marshal a python class into C#? Also, is this solution still being used? Better yet, has anyone done this? One thing I am considering is just using a persistence medium as a go-between (parse in Python, store in MongoDB, and run site in .NET).