I always thought that it's easier to program than to design. Of course, I might get some comments on this line but, I believe you need a different set of talents to create something beautiful, to design something that grabs the attention and pleasures the eye. Usually, the design starts with photoshop and continues on the web in html/xhtml. The hardest part is to migrate your project from it's initial design stage and obtain the same result on a webpage. That's very hard and you need an arsenal full with good knowledge of standards and practices, patience and a lot of creativity; all of them supported and made possible by a good CSS technique. You can't have design without css, without colors and backgrounds, fonts and shapes, sizes or positions and this is just basic, no need to enter in that endless talk about tableless designs, faster and progressive loading of pages and so on...
Gathered in this list, what created a buzz in September, what people talked about and bookmarked or made popular, simply: the best CSS resources of September. Enjoy!

"Creating a consistent interface for your users is a constant struggle for every interface designer."
"Learn by example how to create bulletproof graphic link buttons with CSS."
"If you wish to create visual effects that expand and contract to fit any object, require no image manipulation, and render the same across all browsers, then “Onion Skinned Drop Shadows” may be just what you’ve been looking for."
"CSSTYPE is a web safe typography on screen for pixel perfectionists."
"Huge selection of free CSS based menus"
"Wii buttons. Great resource."
Great list of css resources
"This tutorial will teach you how to create pretty looking textual buttons (with alternate pressed state) using CSS."
"Rich article presenting when and why we should and should not use tables to create our webpages."
"Learn how to create CSS drop shadows"
"This article describes how to take control of your colors in CSS using PHP."
"This site contains free css templates for your website. Just copy and paste and there you have a stunning website !"
"Huge list of CSS tutorials and resources."
"While I believe there are a lot more than 10 reasons to start learning CSS this is a very good article."
"The one I love most when it comes to CSS galleries."
"In this tutorial, Trenton Moss of Webcredible shares some of his top tips to help you get the most from your CSS."
"Through intelligent use of CSS, you can exercise absolute control over your layout, presenting the reader with articles so rich with style that Donatella Versace would be jealous"
"a set of 40 layouts based on the same markup, each with valid CSS and HTML, without hacks nor workaround and a good cross-browser compatibility."
"Some cool free css templates"
"As with most things, a logical and structured approach is the best way to go. Therefore I have put together 10 quick tips (in no special order) to help make your CSS coding as pain-free as possible."