Have a look into a syntax highlighter for your code blocks

GeSHi - Generic Syntax Highlighter :: Home - geshi (this forum uses it) or:
syntaxhighlighter - Google Code - have used this in the past

It will make your tutorials on coding easier for people to read and seperate the code from the description.

__________________
mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)