Thanks to Matt Ellis and some bug hunting of me I can proudly say that we have released Resharper 9 integration for Machine.Specifications. You can now install the plugin by using the provided extension manager in Resharper 9.
For those who are using Resharper versions older than 9 I pushed an update for the plugin for Resharper 8.2. It resolves an issues when you switch from Debug to Release mode or vice versa while having a unit test session open. If you did, you actually had to restart Visual Studio so that the Resharper plugin picked up the correct output path location of the specs assembly. Older Resharper versions are no longer supported as well as the installation via batch files. If you find anyting feel free to open issues on the github repository.