I love the phrase "Eating your own dogfood". It's crude and nasty and actually quite descriptive. See, I'm working on this fairly elaborate piece of software called rm3. I can picture a huge structure that could serve a large high-traffic site with all kinds of neat features built with rm3. But I don't need to do that right away, I need something that's possible for me to write in my spare time.
So, hence, I'm using the third rewrite of some software I wrote instead of doing the actual logical thing... which would be to use WordPress and be happy with it that way.
You can go to GitHub to see the whole project in motion.