Christ I could be hear all year, but a quick suggestion would be:
ACTION: Swordfish, Get Carter (Stallone), Cellular
WESTERN: Unforgiven, Magnificent Seven, Open Range
THRILLER: Secret Window, Fargo, Ronin, Traffic
COMEDY: 40yr Old Virgin, Anchorman, Young Frankenstein, Mr Deeds
SCI-FI: Back To The Future 1-3, Mummy 1&2, Solaris (Clooney), Omaga Man
WAR: 3 Kings, Saving Private Ryan
ROMANCE: Love Actually, Everafter, You've Got Mail
HORROR: Scream 1-3, White Noise, Stigmata
MARTIAL ARTS: Fire Down Below, House of Flying Daggers,
Failing the above you could try El Mariachi, Desperado and Once Upon A Time in Mexico. I've personally watched these films more than I care to remember, and Desperado must be a true 'chick flick' as it was the first film I watched with my wife.
Like I said I could go on for ages. Why not check out the Internet Movie Database at
www.imdb.com, and you could spend ages looking at different types of films.