Oh the joys of CSS. Take this simple layout for example. I won't admit to how many versions and hours I dumped into it. And in the end I went back to a simple design so you just never know. My only goal here is to share as much CSS goodness as possible to make not only my life but your life easier too by listing some of the best resources I have found. I'm always learning new things even after being in this business since 95.
CSS contents and browser
A great list of what css selectors are supported by what browsers.
Especially helpful for figuring out what IE's fail and where since most
headaches come from IE.
CSS support in email clients
Designing an HTML email that renders consistently across the major
email clients can be very time consuming. Support for even simple CSS
varies considerably between clients, and even different versions of the
Truly amazing site depicting the power of CSS.
QuirksMode.org is the personal and professional site of Peter-Paul
Koch, freelance web developer in Amsterdam, the Netherlands. It
is one of the best sources on the WWW for studying and defeating
browser incompatibilities. It is free of charge and ads, and largely
free of copyrights. CSS
contents and browser compatibility
The Ultimate List
Nothing you cant find here on just about every front end web development
topic. A great list to check out.
One of my favorites, maybe it's just the style of writing but I enjoyed
learning from this one.