Although neither the folks at the Heartland Institute nor Mr. Lomborg have confirmed Mr. Lomborg's withdrawal from the institute's Expert List, sometime over the course of the last three or four days his entry was indeed deleted from that list . This may or may not have been due to my efforts, outlined here and here. Naturally, given Mr. Lomborg's centrality to the AGW debate, I made several attempts to contact him. Though none of these messages were replied to, he was was certainly made aware of the institute's billboard campaign.
I would note that Mr. Lomborg previously quit the board of Energy and Environment over their stance re global warming.
h/t John Mashey.