you can use the [sourcecode] shortcode on WordPress.com which is built in for you, no need to install or configure anything.
For example to get this results :
just wrap your code in these tags:
[sourcecode language="css"]
your code here
[/sourcecode]
you can see a list of supported languages and a few other parameters you can use with this shortcode at http://en.support.wordpress.com/code/posting-source-code/
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