Krin Gabbard cites GUESS WHO'S COMING TO DINNER, which is obviously an
example of an interracial couple, but the whole point of the movie revolved
around the race of Poitier and Anne-Margaret and how their engagement
challenged the liberal sensibilities of  Tracy and Hepburn.  It's actually
the epitome of the modern liberal interracial romance film, which strives
to show enlightenment.
An interesting point was made on MIDNIGHT RAMBLE, the American Experience
show about "race" films.  Often, the plots of these films revolved around
what appeared to an interracial romance, until it was shown that one of
the characters (usually the woman) had a *drop* of black blood and was
QED black.
--Don Larsson, Mankato State U., MN