For quick and dirty HTML syntax highlighting, have you tried the Squishy Syntax Highlighter? By way of demo, here's a little CRC32 routine I scavenged last year. Update 3/05: I am using client-side javascript highlighting.
This is a companion discussion topic for the original blog entry at: http://www.codinghorror.com/blog/2004/09/squishysyntaxhighlighter-and-crc32.html