Ah, Nuée Ardente, Pyroclastic flows, probably one of the deadliest things a volcano can throw out, IMHO anyway.
Boiling mud flows and/or lahars are another major danger that's often overlooked. Nasty stuff.
When Mt St. Helens went up, it wasn't the lava that killed, it was the mudflows and pyroclastic flows from the sideways explosion that killed.
Geoff Mackleys youtube video has some good volcanic footage, he seems to be rather a risk taker when it comes to volcanoes, which is morally debatable, but it does make for some good footage:
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