I made a little CSS3 rotate-y loading graphic thing just for kicks. Here's an animated GIF of the glory as it appears in WebKit.

Theories at work:

• Two circles on top of each other. One created by a pseudo element.
• Pseudo circle sits underneath with negative z-index.
• Pseudo circle has inset box-shadow.
• Regular circle has regular box-shadow.
• "Loading..." is a strong tag with hidden overflow.
• Width of strong tag is animated keyframe, doing the reveal, infinitely.
• Text is vertically centered by having line-height equal to height.
• Spinner is a triangle placed above the pseudo circle but below the regular circle with z-index.
• Triangle is rotated from it's tip by changing it's -webkit-transform-origin
• Triangle is keyframe animated to go from 0 to 360deg infinitely.

Ideally, the triangle would be a pseudo element as well, but unfortunately it's a <span>. Pseudo elements cannot be animated (yet). Firefox 4 can transition them, but Firefox 4 doesn't do keyframe animations (yet).

View Demo