On setting up a development environment in Mac OS X 10.6 Snow Leopard

I just bought the new Mac Mini from Apple. It's my first Mac since the Mac Plus of the early 90's and I have to say ... it feels good to be back. I still love doing development on Ubuntu, but Mac OS X is easy to get used to and a lot of fun to play around with. Nothing compares to "apt-get install ..." (on Ubuntu) when getting a development environment set up, but this tutorial for Tomcat 6 probably saved me a couple of hours of agony of going it alone.