This has been big news in the blogs, and elsewhere, and my being behind on everything has not given me the chance to mention it here, but thanks to John Marshall for pointing out this Washington Post article on what was at first being called "oldest Christian church", but which is now being more accurately and responsibly reported. This article seems to get the vote as the most useful and balanced yet, and I mention it for those who haven't so far seen it:
Site May Be 3rd-Century Place of Christian Worship
Discovery Made At Israeli Prison
By Scott Wilson
If this is your first encounter with the story, you should definitely read the article above -- and keep a look out for more on this.