I use the very nice codehightlighter wordpress plugin to beautify my code postings. The plugin works great but there seems to be a problem with the &, > and < symbols which are presented as < and > to the webpage. I did the following changes to the code, a quick 'n' dirty hack, that just works
File: codehighlighter.php
Line: 40 after the line
$code = str_replace('< /pre>', '</pre>', $code);
Place
$code = str_replace('>', '>', $code); $code = str_replace('<', '<', $code); $code = str_replace('&', '&', $code);

