compass is a great way to keep your CSS organized and easily refactorable. I also really appreciate that it lets you use the CSS frameworks like blueprint, YUI, et al, while still using semantic markup!

<div>RP1

Simple rules to get your design looking good in the major browsers.

PSD templates and YUI/blueprint-like CSS setup for rapid web prototyping

Javascript that will give you all the nice pseudo-classes like :first-child and :last-child that are in the CSS spec but not handled consistently in all browsers (or at all in IE6).

A nice reset, base, and typography css. Basically blueprint.css without all the grid stuff. Also includes a compressed version.

Neat way to make shapes out of text.

Extensive list of what CSS syntax is support by which browsers.

"On two separate occasions this month, I’ve been required to produce a layout in which a fixed-width scrolling side “pane” and flexible scrolling main “pane” must resize to fill all available space in a browser window."

This is the solution to allow for transparent pngs in ie6.

This appears to work simply and robustly.

Let's you finally get a peek into what IE is thinking when it is rendering a page