This is getting play in the WCT, but I thought this could use a thread of its own here.
I read a Poul Anderson story many years ago called "The Man Who Came Early", about an American serviceman stationed in Reykjavík, Iceland who gets mysteriously transported 1000 years back into Reykjavík of the 10th century. He knew modern Icelandic, so he was able to talk to the 10th century locals (Icelandic hasn't changed much in the past 1000 years). Unfortunately, his 20th century skills don't translate well. Probably like most of us here, he knew how to use technology, but not how to make it.
Any thoughts from other people out there? Any times in the past you'd like to visit? If you were forced to live there, could you cope?