If you can handle subtitles, I watched Cinema Paradiso for the first time about a week ago, and it's still resonating in my mind. It's brilliant.
If you've not seen The Lion King, that's great too.
If you're a thinker, Fight Club, Pi, Being John Malkovich, Adaptation or Memento.
If you like martial arts, the best one I've seen since Crouching Tiger was The Warrior King, with Tony Jaa. He's the next Jackie Chan - an incredible Thai boxer.
If you like comedy, the funniest film of the last five years for me, hanRAB down, is Borat.
If you like animation, the get Spirited Away, Howl's Moving Castle, The Incredibles, Ice Age.
If you like blockbusters, then Iron Man will be out soon, and that is still rated highly on IMDB. I haven't seen it yet.
I do go on, but you haven't given us a genre to list.