Our .NET library is ready now. Here's the link to it. Try it out and let us know what you think.
@Mike Thanks for the comment & a little nudge. We have minor feature updates almost on a weekly basis and a major feature every 2 weeks. We should update this more often.
EU VAT Support has been rolled out to everyone. http://www.chargebee.com/docs/tax.html
We also released a few smaller improvements as well in the product recently:
Transactional Email Preview
Test webhooks using Events
There are no features listed here?