I haven't seen many movies this year (my money and I go to Cuyahoga Community College) but my favorite movie of 2003 is actually a TV
movie that premiered in 2002:
Carrie -- the NBC/MGM made-for-TV version. Sort of a cross between a remake (a few scenes were basically reshot from the 1976 version) and a new version (many popular references were updated.) This version hit home more than the 1976 version, for me... And I first saw it when it reaired on June 7, 2003; it was released on DVD/VHS on August 12, 2003.
I even made a website about it: