AYZ - seconded (fifthed?) a must read, a gem of the genre. Heinlein do others, notably the 1941 precursor "By His Bootstraps", and some aspects of "The Cat Who Walked Through Walls" later.
Some others that I thought were reasonably good ideas that deal with the consequences of the underlying what-if:
1: Only information can be passed back through time, in such a way that it can be used to change the future. The great James P. Hogan story "Thrice upon a time" is a good illustrations of this trope.
2: Stuck in a time loop until you get it right. "Groundhog Day" for example (also a Xena rip-off that was not too bad).
3: Go back to occupy somebody's body in the past, e.g. "Peggy Sue Got Married", or a recent Warehouse 13 episode. I dimly recall only one instance where the impact of this on the original conscousness was dealt with in depthm but forget the title - ??
I do not really consider parallel worlds to be time travel themes.
There's a list of 213 time travel related movies at Wikipedia.
Most of Hollywood's ideas about time travel are rather silly.
(2012) Here is a 700+ list of movies containing a Time All Time Travel element, which considerably expands on the tropes of Time Travel: All Time Travel movies, 1896-2015.