Could I suggest a CSS forum where users can post any additions they have made to their style sheet, how it works, where it goes ?
I'm not saying that it should be anything based upon basic mods like font changing, background colours, but extra's - like creating a class that will center an image / text, and the appropriate use of the resultant div to keep the page xhtml compatible. (maybe that should be a criteria ? I don't know .. it's late here :) )
It could end up being a neat additional resource in itself ?
Feel free to shoot this down !