I try to do my part for Wikipedia, although I tend to not really add anything of use to the site besides vandalism reversions and spelling and grammar corrections because everything is already on this ginormomassive (Gigantic + Enormous + Massive) encyclopedia.
I like shiny things.
And I just learned how to actually make a list look like a list on Wikipedia.
I've contemplated the use of my user page as a personal sandbox, but I'm definitely learning stuff from it.
When linking an article to a category, you can tell the category how to sort the article alphabetically by using a piped link. For example, [[Category:Baroque composers|Bach, Johann Sebastian]] will alphabetize Johann Sebastian Bach in Category:Baroque composers under B instead of J.