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Well, there's A Conneticut Yankee in King Arthur's Court by Mark Twain and The Time Machine by HG Wells. The classics.

And then there's time travel romance, which seems to be a big sub-genre of romance. Here's a bit of a list: http://www.womensforum.com/time-travel-romance-nov...

Connie Willis has several, including The Doomsday Book and To Say Nothing of the Dog.

We just released a book with some time travel in it. It's called Tangerine. The time travel is not like the usual stuff, though.

I liked "The Time Traveler's Wife" by Audrey Niffenegger