Another late pick, but I am going a little unique this time.  I havn't chosen just a standard web site or blog, but Smashing Magazine is just fantastic. For a web pro, you will get all sorts of articles about design, free items and general web discussion.  I have never been disappointed by one of their articles as they are each well written and often are about things I am not very familiar with. And if great articles are not enough, they have a great freebies section that collects all sorts of free things for designers.