HTML Entities...

Quoted: A table of the HTML 4 entities for symbols and Greek letters.

Quoted: In this article that goes hand-in-hand with the release of Emails-Standards.org, David Greiner explains what you need to do to ensure that your emails not only look great in today’s email clients but also actually make it to where they’re going.

Highly recommended. With html + css, there are many ways to do different things (tabs, font sizing, etc.). This book gives you the "best" and most "bulletproof" way based on the author's own experience as a web developer.

Quoted: Each chapter starts out with an example of what Dan refers to as an “unbulletproof” concept—an existing site that employs a traditional approach and its associated pitfalls. Dan then deconstructs that approach, noting its downsides and then making the site over using Cascading Style Sheets (CSS). By the end of each chapter, you’ll have replaced traditional, bloated, inaccessible page components with lean markup and CSS. The guide culminates with a chapter that pieces together all of the page components discussed in prior chapters into a single page template.

Noticing this bug at the moment:(

Quoted: In Explorer for Windows there are two display errors. One, the container is only containing the last line of floats , and the floats are also running off to the right, all the way to the right screen edge! Take it from me, folks, that is not kosher.
...
Screenshot in IE6

An explanation of why margins are collapsed in css...

Quoted: Why is this? Because it's what authors would tend to expect. If you declare top and bottom margins of 1em for paragraphs, odds are that you want one em of space between successive paragraphs. If you're feeling dubious about that assertion, consider this:

Pretty helpful if you need to style a table.

looks helpful

i've used this on before. it handles lots of the complexities of tooltips for you.

might help.