Another Friday afternoon Mac post, sorry Windows people. Ars Technica takes a look back at the last 5 years of OS X. For you fogies out there, we can remember that OS X was arguably the second most important thing that Jobs did upon his return to Apple (the first being the iMac). OS X made Macs cool for developers to use and many normal folks followed their lead. Nice retrospective for this piece of tech I use every day.