Hey Bruno, the site looks great. After taking a breath, one might think of integrating FAQ & plugins, slices into the new layout site. Then, a single sign in would give access to FAQ, slices and plugins etc.
Generally all becomes more accessible. As others pointed out, a more lighter look would be a bit more welcoming. A submenu would also be a good help. What do you think about adding a planet site where you aggregate important blogs? Also, you may want to provide a RSS link for the home page that streams updates. BTW, why was the feeds_reader.py put into models and not into controllers? Thanks for these efforts.