….Googled it!

First atempt: Ended up here, tried [sourcecode language='css']…[/sourcecode] and got no result. (guess that this works only for wordpress.com users….no harm done)

At a second try: got a plugin here (syntaxhighlighter Google Code project by Alex Gorbatchev). Copied it to my server into the wp-content/plugins, activated it from the wp-admin and… that’s it. It works like this: Place your code on the page and surround it with < pre > tag. Set name attribute to code and class attribute to one of the language aliases you wish to use. Works for: XML/HTML, C++ (cpp, c, c++), C# (c#, c-sharp, csharp), CSS (css), Delphi/Pascal (delphi, pascal), Java (java), Java Script(js, jscript, javascript), PHP (php), Python (py, python), Ruby (rb, ruby, rails, ror) , Sql (sql), VB (vb, vb.net ).
After playing around a bit with the style my first try looked like this:

if($you_can_see_this)
            echo "syntaxhighlighter works!";

So from now on i will post pieces of code that trigger my attention.