I put server in quotes because it is really just a PHP script that handles the caching and talking to the application servers. Apache and other HTTP servers already do a good job talking HTTP to a vast myriad of clients. I did not see any reason to reinvent the wheel.
Features of this new version include a TTL for the cached data, minimal dependencies for the application to use and a small code base consisting of two files. It also handles HTTP 1.1 requests, is transparent and applows pages to dynamically be specifically added and removed from the cache.
You can download this latest version from the project's page on the Google Code website.