The former Rocky Run location immediately comes to mind.
It won’t be the first time a Baltimore pub has tapped into the Columbia scene. Last year the Dog Pub in Federal Hill took over the former Hard Times Café location on Dobbin Road and opened Pub Dog.
I wonder if these establishments are simply following their young clientele as they move from urban singles to young families seeking good schools.
UPDATE March 16, 2009: Well they didn't exactly land in Columbia but Looney's Pub is now open in the space formerly occupied by Trapeze in Maple Lawn, just in time for this years St. Patricks Day celebrations!