TightBlog 3.7 released just now: (Release Page). This version requires a few database table changes over 3.6, if upgrading be sure to review the database instructions given on the release page. Features updated comment and spam handling processes, as described on the TightBlog Wiki.
Just-released TightBlog 3.6 (release page/screenshots/installation instructions) now provides an endpoint for embedding GitHub source code in your blog entries, see here for a sample and the Tightblog Wiki for more details. Previously I had to rely on third party tools hosted on other servers to accomplish the same, but happy to report this functionality is now available out-of-the-box with TightBlog.