For adding exchanges i need C# based open-source libraries.
They need to contain (for the most part) all the trade logic like poll, trade-depth, wallet, open-orders, buy and sell. And i need to review and approve them.

I was talking to somebody who wanted to create a DLL for Cryptsy but i did not hear from him in days. I wanted to give him a donation for it and i has to be published to the community.

So if you have any suggestions, i am open for it.

Edit:
I will not add MtGox. I do not support them because i do not want them to grow any bigger. To much depends on them already.