Ability to use external plugins can both go unnoticed or define software success.
Extendably is blog run by Josh (one of the more active ghacks co-authors) that is focusing on plugins and extensions to software. I think it's extremely cool theme to pick. Clearly original comparing to blogs that try to grasp general large picture (like mine :) ).
Visually blog looks very clear with moderate blue-gray colors. There are some empty spots and pages but I guess time will fill them.