Case study in use of bold over at Google Reader-- their subscription list, when unread... is very unread.
That's a lot of bold. When everything is bold, nothing is bold. Because the blogs themselves and the folders have the same weight, you fail to differentiate and set up a visual hierarchy. Much better would be to lighten the folder headings, and/or possibly make them smaller or larger -- distinguish them in a way so that viewers can have more of an at-a-glance ability to classify and understand what's on the page. Contrast signifies information. When you design stuff, don't waste contrast.
