Scott Jurek started on May 27.
Going South to North (Georgia to Maine)
Approximately 2200 miles.
Current record is 46 days, 11 hours, 20 minutes by Jennifer Phaff Davis.
The toughest portion of the trail is in New Hampshire and Maine.
He'll need to average about 50 miles a day to break the record.
Here's a few links:
His Facebook page (daily updates):
https://www.facebook.com/ScottJurek
http://www.whiteblaze.net/forum/showthread.php/111652-Scott-Jurek-on-Appalachian-Trail
http://fastestknowntime.proboards.com/thread/6/appalachian-trail
I hope he sets a new record!