I comment on The Oil Drum, therefore I exist.

Yes, that was it ;-)

Commento, ergo sum

I'm a radical neo-cartesian and refuse to create any conclusions: I think. Therefore, I think.

There's a shorter name for that: Zen.
Or some might say, "bleedin' obvious"... but it is a surprisingly powerful concept that many people have forgotten about ;-)

"You can never solve a problem on the level on which it was created."
Albert Einstein