Simpler way to upgrade WordPress
I love WordPress and the ecosystem (plugins and themes) behind it. However, upgrading WordPress is generally a tiring event and not something I really look forward to. So when Mark Jaquith provided a diff to upgrade from 2.1.2 to 2.1.3, I quickly jumped on it.
A quick test with
patch -p0 --dry-run < diff-file
seemed to indicate no issues and then applied the patch for real