Go to motionographer to watch this super sweet commercial. Awesome sound as well! But the different "creatures", the compositing, lighting, all in all, awesome.
Then, go to dailymotion and watch "La main des maitres", which looks really nice as well. Great style.
Last but not least, the "Left 4 Dead" blog gives you the cinematic intro to the game. Lots of action and definitely an idea springboard in case you want to do more physical animation.
All of these were found @ 3Dtotal