While I've been spending most of my mental energy getting ready for my own 48-hour event (48 miles in 48 hours), Dean Karnazes just went ahead and did his own to try to break a world record.
Dean ran on a treadmill in Upper Manhattan for 48 straight hours this past week to try to break the Guinness World Record of more than 240 miles. Though it didn't happen, Karno ran over 200 miles in 48 hours. Runner's World covered it here.
Geez, that certainly makes 48 miles in 48 hours seem paltry in comparison. Then again, to even be running 1/4 the mileage that he does is certainly an accomplishment.