Seems very similar to last years late frost for me here in NE Iowa (45 miles north of Waterloo or 20 miles west of Loran :) )

link to video done last night

http://link.brightcove.com/services/player/bcpid76904907001

Link to video 5-16-09 (last years frost damage)

http://www.youtube.com/watch?v=RNsZa7sMlmA&NR=1

Follow up video ten days after frost damage occured 

http://www.youtube.com/watch?v=2lKJvrUzmKY

This years frost (for me) seems a little more serious, but after digging up numerous plants growing points have not been effected and any tissue that was at or below the soil level was protected by the soil temps (49 F).  I think it would help bring the new growth through faster if we had some sunny and warmer weather coming, but time will tell.

Hope everyone else's corn comes through well.