Vince Gilligan says tonight's episode "is the best we have had, or ever will have." My body is ready.
The title comes from the Percy Bysshe Shelley poem, which Wikipedia says, "illustrates the futility of humans building empires, because there is nothing that humans can do to prevent the erosion of their empires by time."
AMC was nice enough to put up this video, featuring Heisenberg himself reading the poem:
Also, Ozymandias was a character in Alan Moore's graphic novel Watchmen, which, if you haven't read, you totally should.