Connie Willis wrote several SF works around the theme of historians in 21st century Oxford travelling back in time as part of their studies. The short story Fire Watch is online and serves as a good introduction. If you like it a lot, you should probably try reading To Say Nothing of the Dog or Doomsday Book.
Overall, I did like Blackout/All-Clear, but the aspects of time-traveling and universe taking a special interest in human-level 'big happenings' were unconvincing for me.
Not really the point of the story of course, but if one introduces time-traveling in a story, it should be thought trough a bit more, I think.
This is the monthly thread for posting media of various types that you've found that you enjoy. I find that exposure to LW ideas makes me less likely to enjoy some entertainment media that is otherwise quite popular, and finding media recommended by LWers is a good way to mitigate this. Post what you're reading, listening to, watching, and your opinion of it. Post recommendations to blogs. Post whatever media you feel like discussing! To see previous recommendations, check out the older threads.
Rules: