Sean mentioned this in a tweet this morning - GBS performed live on FOX Boston. To watch performances of "Boston and St. John's" and "River Driver", go to http://www.myfoxboston.com/dpp/morning/great_big_sea_performance_082009
I have no idea why they decided to do two slow songs - is this representative of their current live shows now? IMHO, I'm not sure that will win them any new fans, but it was nice to see them on TV.