How can I draw vertical text with CSS cross-browser?

I am using the following code to write vertical text in a page. Firefox 3.5+, webkit, opera 10.5+ and IE

.rot-neg-90 {
    -moz-transform:rotate(-270deg); 
    -moz-transform-origin: bottom left;
    -webkit-transform: rotate(-270deg);
    -webkit-transform-origin: bottom left;
    -o-transform: rotate(-270deg);
    -o-transform-origin:  bottom left;
    filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=1);
}

The CSS Writing Modes module introduces orthogonal flows with vertical text.

Just use the writing-mode property with the desired value.

span { margin: 20px; }
#vertical-lr { writing-mode: vertical-lr; }
#vertical-rl { writing-mode: vertical-rl; }
#sideways-lr { writing-mode: sideways-lr; }
#sideways-rl { writing-mode: sideways-rl; }

<span id="vertical-lr">
  ↑ (1) vertical-lr 至<br />
  ↑ (2) vertical-lr 至<br />
  ↑ (3) vertical-lr 至
</span>
<span id="vertical-rl">
  ↓ (1) vertical-rl 至<br />
  ↓ (2) vertical-rl 至<br />
  ↓ (3) vertical-rl 至
</span>
<span id="sideways-lr">
  ↓ (1) sideways-lr 至<br />
  ↓ (2) sideways-lr 至<br />
  ↓ (3) sideways-lr 至
</span>
<span id="sideways-rl">
  ↓ (1) sideways-rl 至<br />
  ↓ (2) sideways-rl 至<br />
  ↓ (3) sideways-rl 至
</span>

Updated this answer with recent information (from CSS Tricks). Kudos to Matt and Douglas for pointing out the filter implementation.

.rotate {
  -webkit-transform: rotate(-90deg);
  -moz-transform: rotate(-90deg);
  -ms-transform: rotate(-90deg);
  -o-transform: rotate(-90deg);
  transform: rotate(-90deg);

  /* also accepts left, right, top, bottom coordinates; not required, but a good idea for styling */
  -webkit-transform-origin: 50% 50%;
  -moz-transform-origin: 50% 50%;
  -ms-transform-origin: 50% 50%;
  -o-transform-origin: 50% 50%;
  transform-origin: 50% 50%;

  /* Should be unset in IE9+ I think. */
  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=3);
}

Old answer:

For FF 3.5 or Safari/Webkit 3.1, check out: -moz-transform (and -webkit-transform). IE has a Matrix filter(v5.5+), but I'm not certain how to use it. Opera has no transformation capabilities yet.

.rot-neg-90 {
  /* rotate -90 deg, not sure if a negative number is supported so I used 270 */
  -moz-transform: rotate(270deg);
  -moz-transform-origin: 50% 50%;
  -webkit-transform: rotate(270deg);
  -webkit-transform-origin: 50% 50%;
  /* IE support too convoluted for the time I've got on my hands... */
}

Another solution is to use an SVG text node which is supported by most browsers.

<svg width="50" height="300">
    <text x="28" y="150" transform="rotate(-90, 28, 150)" style="text-anchor:middle; font-size:14px">This text is vertical</text>
</svg>

Demo: https://jsfiddle.net/bkymb5kr/

More on SVG text: http://tutorials.jenkov.com/svg/text-element.html