Here's a partial transcript of a Q&A with Matz at RubyConf, via Chris.
Q: Did you start Ruby to scratch a particular itch? A: "No. The only problem I wanted to solve was to fill my spare time. It was during the depression time in Japan, and I had a job, but no assignment, and I was bored, so I started Ruby."
A painter paints, and a programmer...
Also, he recommends checking out Steve Dekorte's language IO and Haskell.
Here's a weblog with much more info on RubyConf, including audio for the presentations.
Update: More on RubyConf, via Chris.
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ColdConfusion: Sep 5, 8:36pm