Orange Goblin are a stoner/doom metal band from England, formed in '95. I had first heard of them thanks to a promo CD which had a bunch of artists that had the whole southern rock/stoner vibe going on (Alabama Thunderpussy and the like). I liked them immediately, even though I had never heard anything like that, except Black Sabbath.
The music really shouldn't need a description if you're familiar with the whole stoner/doom thing. If you want to compare, I would say it's a mix between Electric Wizard and Fu Manchu.