It's appositival, if it's there. And it doesn't have to be there. And it's really obvious that it's there when it's there.

If you and I always agree, then one of us is redundant.

Down that path lies madness. On the other hand, the road to hell is paved with melting snowballs.

I think the way IBM has embraced the open source philosophy has been quite astonishing, but gratifying. I hope they'll do very well with it.

Some of modern engineering is necessary to good art. But I think of myself is a cultural artist.

We're really serious about reinventing everything that needs reinventing.

The purpose of most computer languages is to lengthen your resume by a word and a comma.