Dr. Rex Koivisto of Multnomah Bible College is a tagging machine. He has been instrumental in the development of the vast majority of Accordance's grammatically-tagged Greek texts, and I never cease to be amazed at the amount of new material he manages to produce every year. Dr. Koivisto is also a pioneer when it comes to the tagging of actual Biblical manuscripts such as Codex Bezae and Codex Vaticanus (as opposed to edited editions of the Greek New Testament).
At the recent conference of the Society of Biblical Literature, Dr. Koivisto presented a fascinating paper describing the challenges of representing manuscripts in an electronic format, and the solutions he's come up with. If you're interested in knowing more about how to use Bezae and Vaticanus in Accordance, or if you want a behind-the-scenes look at the effort required to produce grammatically-tagged texts, I'd strongly recommend you read Dr. Koivisto's paper.