I whittled my favorite moves down from another list I have. I rate movies on the "rewatchability factor". A good example of something that does not make my list is The Dark Knight. Good film, but one viewing was good enough. The following list is comprised of stuff I watch over and over again. In order of release date:
Charlie Chan films (Sidney Toler & Mantan Moreland) - 1940s
The Great Escape - 1963
The Professionals - 1966
Chariots of Fire - 1981
Back to the Future - 1985
The Hunt for the Red October - 1990
The Last of the Mohicans - 1992
Maverick - 1994
Contact - 1997
Oceans Eleven - 2001
The Bourne Identity - 2002
Secondhand Lions - 2003
Elf - 2003
National Treasure - 2004
Ratatouille - 2007
Out of those, The Bourne Identity wins out every time for me.