Hi, one of the people commenting here asked for a way of displaying code in one of my themes.
For ages I have been using the following code and it worked flawless in connection with the code markup plugin for wordpress:

.primary pre#hack {
		white-space: pre-wrap;		/* css-3 */
		white-space: -moz-pre-wrap !important;		/* Mozilla, since 1999 */
		white-space: -pre-wrap;		/* Opera 4-6 */
		white-space: -o-pre-wrap;	/* Opera 7 */
		word-wrap: break-word;		/* Internet Explorer 5.5+ */
}

.primary pre {
  overflow: auto;
  cursor:pointer;
  position:relative;
}

.primary pre code {
  display: block;
  margin:10px;
  padding:4px;
  border:1px solid #ddd;
  background:#F5F5F5;
  font:10px Lucida Sans Typewriter, Courier, monospace;
}

.primary can be changed to what you need, e.g. .post or .entry

Usage within Wordpress
Simply go to the “code” editor of Wordpress and paste your code.
Surround it by a < pre > and < code > tag and add the id of “hack” to the < pre >.
(< pre id="hack" >< code > stuff here < / code > < / pre >