For a really helpful analysis of this newsy item, copy and paste the link below into your browser and read it. Ben Witherington is a world-renown scholar, professor at Asbury Seminary in KY, a great evangelical theologian. He's a good writer and great thinker. His post includes a link to the Toronto Star article that highlighted this issue.
For the record, based on the limited reading I've done, and the trust I place in particular scholars, I believe that this story is based on shoddy work, promoted by brilliant men with an eye for flash and an ability to make a big buck. Though I'm not opposed to asking hard questions about the stories of Scripture, my presupposition is that they are trustworthy, thus when "discoveries" come to light that cast the Scriptures as untrustworthy - I'm a little wary.
Of course Christians are going to seek to discredit these findings, if the tomb is Jesus', and he had a wife and kids, we are fools. So how does a Christian respond without precluding the answer due to fear and deep-rooted bias? Examine the facts, use ruthless logic and truth, assume nothing, and question all motives, including your own.