A video from a nice session on Time Travel (Anne French, Ken Perszyn and Nick Smith) is available here. The sever hosts also Colossal Squid Lectures (they have nothing to do with time travel, afaik, it's just the title is so cool I couldn't help but mention this).
Nicholas J. J. Smith's research website links to a few fun papers about time travel as well. Among others: Why Would Time Travellers Try to Kill their Younger Selves? and Bananas Enough for Time Travel?