they've done three albums to my knowledge, the first one, then Evil Empire which was released in '96, then Battle for Los Angeles in '99 i think
the first two are absolute classics, basically the sound track to my youth, and Evil Empire, in my opinion, is a contender for the best album of all time, incredibly well crafted music
not sure why but i just didn't connect with the third album, i think i gave my copy away actually, years back