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Change the tap highlight color in WebKit Mobile-using devices (many of them).

Looks at your CSS and tells you what's wrong with it.

Return to this. A good set of standards, including some things that I wasn't aware of and would like to implement.

Sounds stupid and listy but it's actually a good introduction to some of the more useful and practical pieces of the huge insane HTML5 Boilerplate (html5boilerplate.com).

Jury's out on how much this really matters in 2010, but still a great set of tips.

"Compatibility tables for features in HTML5, CSS3, SVG and other upcoming web technologies."

How to make an background image scale without using a ton of JavaScript.

What 'the web' actually is, and why building desktop-class applications on it is not what it was built for.

Using CSS to detect device size (for things like iPads and iPhones).

This may be worth looking into. I waffle on whether this sort of thing is ultimately a good decision — you're relying on someone else's framework, it takes a while to learn and master, and once you decide to go with it you're essentially stuck with it. But isn't that the case with any pseudo-framework developed for a website design? I should test this on a little project.

As seen on Normative.com.

Invaluable for troubleshooting web development in IE. Wish I'd known about this before today!

Detailed to the point of being almost unreadable!

Ugly "Browse..." buttons be gone!

Using one large image with all of your smaller images inside of it, and using CSS to position the background into the right position.

How to hide unsightly outlines.

Apparently "tags" is a reserved name in IE. For anything.

"the little JavaScript and CSS bundle I've been working on that makes developing iPhone web apps easy."

Reveal box model and other style information for visible elements on a webpage.

A table of who supports what.

Checks through CSS and HTML to find redundant and unused style definitions.

What works in which browsers.

They look nice.

Beautiful, cross-compatible buttons in CSS.

A huge and valuable collection.