It has been a while since I upgraded the key components of my application stack. This decision was driven by a desire to use PostGIS is a current project, and it appears that MacPorts has designed the latest version of PostGIS to work with PostgreSQL 9.2.
With an upgrade to Mac OS X 10.8 (Mountain Lion), PHP's sendmail() inexplicably ceased working. I knew that a number of things got re-defaulted (like /etc/paths) but this seemed a bit different.
I often tell my students that I am lazy as a programmer. I typically try to convince them that this is a good thing. The point I'm trying to make, of course, is that often the best line of code is the one you don't have to write.