Gamevideos has posted three new Left 4 Dead videos today showing off a variety of effects. I've summarized the main things under each video. GO!

Revive:

Good display of the new vomit effects. It looks crazy when you're being charged by zombies down a narrow hallway and your vision is distorted. The overall effect is just terrifying. I love it.

Last Stand:

This one shows off the brutality of the Witch. Also, check out the bloodbath that ensues as Louis is getting attacked. Valve might have gone a little overboard with the blood decals, but at least they look good.

Explosion:

Takes place during the finale. At around 1:49 you can see the Tank nail the player with a hunk of the environment. Awesome.

Overall, it seems that with every new video that comes out, the game just keeps looking better and better. However, I want to know how the Infected side is going. I've yet to hear any updates on the situation, and that kind of worries me. I understand that they probably want to perfect the Survivors before moving on to the Infected, but I wouldn't mind a little info. Then I remember it's Valve we're talking about and all of my worries disappear.

If you haven't yet, go check out the L4D video extravaganza that was on the front page yesterday. You will be pleased.

Note: According to 1up, the help messages come up only for new players and will go away after a few plays.