Probably some disagreements here but...

Toy Story - Original, other two lacked a little, but still on a whole different level to other animations.
Anchorman - Never gets old or any less funny each time I watch it.
Ocean's 11 - The comedy side lacked, but the cleverness of the operation was pretty cool.
Inside Man - Watched it for the first time a few nights ago, set a new level for cleverness of robberies that I've seen. Need to watch again to fully understand it.
Rock N Rolla - One of the best films to come out of UK imo. Preferred it to Lock Stock.
The Dark Knight - Obvious choice for some. Watched it for the first time today. Rather enjoyed it.
The Hurt Locker - That shit was pretty good.

Maybe not revolutionized cinema, but my personal must owns.