Okay, so I just watched Torchwood: Children of Earth ( I know, I know...I'm a huge procrastinator) and would love to play with a Jack who's not quite so angst-ridden. Obviously that precludes most Torchwood-based sls, and, though I know it's been done a million and a half times, I'd love to go back to the Three Musketeers of Jack/Nine/Rose; something between The Doctor Dances and Boom Town, possibly? Failing that, I think it would be interesting to have Jack come back into the picture before the end of season 2 and actually have a discussion of, "But I thought you were dead," which was not really explored at all when all of the Doctor's companions got together in season 4.