Add code examples to posts

Hi

I use my blog to write tutorials for html/css/php etc

I need plugin that displays the code nicely – at the moment I surround the code with blockquote tags, which works but isn’t great.

Every time I search I fing how to add code without it getting stripped – which isn’t what a want to do.

Can you please suggest plugins or even what I should google to find what I am looking for!!!

Thanks