I've read through your post, the linked tutorials, and some of the source in your repo. Right now I think I understand how consumers use the client code.  I don't quite understand the endpoints on the service side yet, but I'm sure I'll get there. I can theoretically understand some of the benefits this library provides, but I don't know C#'s tools for OData queries well enough yet to understand how this can be helpful for practical development.

Overall, this post reads really well, and the library you've written seems quite complete and well written!  That library looks like it was very difficult to write and took a lot of effort (+100 passing unit tests...wow)!  I'm excited to read more about OData, try out Microsoft's C# tools around the OData spec, and understand your code more.  I'll post more comments when I understand these concepts and implementations better.  

I think this post is solid for release.  How do you want to release this series?  Do you want to write all the posts, then release them successively?  Do you want to release one at a time?  Are you concerned that future changes to the libraries' API may make these posts confusing?  I'd guess this libraries' API will change because it hasn't gotten much usage yet.