A wonderful site that I can't believe I haven't already put up before. It's the Mount St. Helens VolcanoCam. It takes a snapshot of the volcano every couple of minutes. There's currently a lot of activity at the volcano. A large piece of lava is currently shooting out of the middle of the crater. It is growing upward at an astounding rate of 5 feet per day. Amazing stuff to see nature at work right in front of your eyes.
Also, at night you can sometimes see small glowing dots in the center of the picture. Those are actually small hot lava pockets in the crater. They have old archived pictures on the site of the glowing lava if you aren't able to spot it.