lol, there would probably be more replies if you talk about your favorite films first.
One sentence starter threads are not exactly thought provoking.
Anyway, assuming we ignore Wuxia movies and focus on semi real martial arts, besides the obvious Bruce Lee, Jet Li, and Jackie Chan movies, I want to mention this one:
Bruce Lee's Kung Fu teacher - Yip Man's story was dramatized and made into a movie trilogy.
Edit to add: I had completely forgotten to mention this, but Ip Man 1 and 2 are played by none other than Donnie Yen, who probably deserves to be up there as one of the movie martial arts greats.
http://en.wikipedia.org/wiki/Donnie_Yen
Check it out:
[youtube]http://www.youtube.com/watch?v=yF6Jyxc16vU&feature=related[/youtube]
[youtube]http://www.youtube.com/watch?v=XNb7xcs2QP4&feature=related[/youtube]
[youtube]http://www.youtube.com/watch?v=BwDzcE3mNco&feature=related[/youtube]
[youtube]http://www.youtube.com/watch?v=31UCc8sNYaA&feature=related[/youtube]