The CryptoConnector project on GitHub is alive and well, having recently released v1.0.2 (a bug fix release)
This release contains some fixes to recognize bugfixes on the Coinbase end of things.
You can grab it here: https://github.com/chrisgwilliams/Coinbase.NET/releases
Coinbase has recently informed me of some new API changes, which will be incorporated into release v1.0.3.