Regardless of what you think of ESR's personality, politics or hacking skills, I found this to be a pretty good read.
There's lots of good things in here that apply - not just to software written for Unix systems - but for software in general (I guess it's not really a coincidence that a lot of the good practices on Unix are good practices in general).
Edit: Joel Spolsky's take on it: http://www.joelonsoftware.com/articles/Biculturalism.html