I'm running OSX Yosemite on a 2006 Mac Pro 1,1. It wasn't too difficult once I had the correct boot.efi, and it works flawlessly. With an SSD, a minor CPU upgrade, and a recent video card it's nearly as fast as a 2013 Macbook Pro.
I'm thinking of switching it over to Linux though, I'm no longer happy with the direction in which Apple is headed, and I do nearly everything in the terminal and browser anyway.
About a year ago I learned how to bake a good sourdough loaf, and have been doing it about once every week.
It's not exactly dense, but it does seem to be much more substantial than mass-produced squishy bread. A single buttered slice of sourdough toast is incredibly delicious, and is often all I need for breakfast. Though it's tempting to eat half a loaf right after baking...
We use it in production, but are migrating away from it for some projects since that data is better suited for a relational DB. Some developers were too quick to jump onto the NoSQL bandwagon a few years ago.
For certain uses it's great, once you've wrapped your head around writing map/reduce views. It really shines when you need to provide a read-heavy JSON backend.
I've never written views in Erlang (actually, I've opted for higher abstraction and used Coffeescript), but now that I have a little functional programming experience with Haskell, I'd like to try it out.