http://www.astronomy.com/asy/default.aspx?c=a&id=8536
WASP-17, a transiting Hot Jupiter which is about 1000ly away, is apparently orbiting in a regtrograde orbit. The article says it was possibly caused by a gravitational interaction between it and another planet at some time in its early history.
Well, that planet's fate is sealed...it'll eventually fall in towards the star and vapourise.