That was only one of two songs I think, where he used a talk box. The other one was on The Division Bell, if memory serves.
He also used a talk box on Dogs, now that I think about it, to make the barking sounds you hear in the middle section.
I'm really hoping he busts out a flute for the next album so he can throw down some Aqualung. He already plays the guitar, bass guitar, drums, keyboards/piano, harmonica and saxophone. Give Ian Anderson a run for his money, David!