Listen to the enthusiasm in the voice of Brian Cantrill. The 31-year-old senior staff engineer at Sun Microsystems created DTrace for Sun's Solaris operating system. DTrace provides systems administrators with real-time software diagnostics.

For his work, MIT's Technology Review named him one of its young technology innovators.

I caught up with Cantrill at MIT's recent emerging technology conference, and he explained why the app is so important. Listen to the interview. And, remember his name. He's going places.