A well organized site about CSS3, CSS3 info, comes from Joost de Valk in the Netherlands. In addition to a blog, the site describes its contents thus:
At the moment we have three sections: a CSS3 Preview, which shows you individual CSS3 features that are implemented in browsers today, and how great they are. Next to that, we have the CSS3 weblog, where we have introductory articles and news concerning interesting CSS3 stuff as it comes along. The last section is the modules section, where we keep a list of the current modules and their status, and where we will add more and more compatibility tables.
This looks like it is going to be a valuable resource as more bits and pieces of CSS3 are implemented by the browsers and the W3C moves closer to making CSS3 the current standard.