2.3.1 is the current stable release.  I've taken a look at 3.0.0-SNAPSHOT and seen some of the API changes and commented to Matthias, Shawn, and the JGit team  about a few.  I don't mind switching master to 3.0.0-SNAPSHOT sooner than later, but I don't intend to release the next Gitblit with a SNAPSHOT dependency.