Another site that I check pretty regularly is CSSPlay, and while it isn't as much of a blog as some of the other sites that I read, there is an amazing amount of useful information for using CSS to enhance web-design.  As you look around the site at some of the many different examples of CSS, one of the most interesting things that you will discover is that there is no javascript used.

CSSPlay
 
CSSPlay's creator Stu Nichols describes why he created the site this way:
"I have created this site in the hope that it will help newcomers to CSS and show old hands that it is more than just a mechanism for styling your documents. It is oh so much more."

Some of the more interesting ways that he demonstrates the versatility of CSS is in his menu demonstrations.  There are about sixty or seventy different menu demonstrations with everything from dropdown/flyout menus, sliding image menus, and even a hidden pull tab menu.  Menus aren't the only way that he implements the advanced uses of CSS however, you can find photo-galleries, maze puzzles, calendars, and even mouseover animation.

I haven't used any of his examples on this site yet, but I plan on adding in a few menus, and I have used some of his ideas on other sites I have created.  As the web ventures into what is being called "Web 2.0" with Ajax popping up everywhere, and interaction being a necesisity, it is nice to see someone getting everything that they can out of some of the already existent technology.  CSSPlay is a great resource to have in your toolbox as you develop your site, check it out and let me know any other sites that you think are pretty handy when it comes to web-design.