In our e-ottings group we had a "Big-Fight" about google's new perosnalized portal. Ppl argued about the various aspects of it. Some said it was brand new and some complained about it as the old concept. Inspite of all these difference in opinions, everyone agreed on the fact that the customizations provided by google is awesome from the usability perspective. Thus I learnt the significance of usability.
This blog was originally using "Minima Black" template and there were complaints about the dark background causing hinderance. To alleviate this concern and to improve usability, I have switched on to "Harbor" template. The contents part of this template contains white background with black text color. I even remember reading some where that this is the standard and recommended format for presentations.