I was at the 07 Super, the Auburn game, and both games this weekend, and without a doubt, 07 was the most packed out of all those games. The bleachers were deceptively packed... We were in right field and we were pretty spread out with holes around us. Can't say the same for left field... Also, there were a surprising amount of empty seats in the grandstand... about on part for the Auburn game and far less than 07.
07, you couldn't move in the bleachers and the outfield was comparable to what was there last night... I imagine what you are seeing is actual paid attendance being reported since it is an NCAA regional.
However, the shocking thing is seeing all those people lined up before the game outside the stadium... there's no way there weren't at least 14-15,000 in line around the stadium.