Yup.
Tonight on Nova, PBS, at 8PM, "Mystery of the Megavolcano" about the ruption of Toba.
Still considered to be the single greatest eruption in the last 100,000 years. Even before that, I think it was only rivaled by the Yellowstone caldera stuff 2 mill yrs ago.
Last Yellowstone eruption = 640,000 years ago. Six feet of ash in Nebraska and the Dakotas.
BTW, Yellowstone is 40,000 years over due for an eruption. If a 'Super-Volcano' goes off, don't bother running, you'll just die tired or starve.