I'd love to do it

but seriously, I wouldn't mind, it might get me back to really playing, and it'd be nice to actually contribute to the site

Well, that makes three people who've expressed an interest. And you are all pretty trustworthy.

I wonder whether anybody playing here has edited Wikipedia before. It's not so hard to figure out the basics, but some of the stuff is so complex it hurts my brain

Most pages simply use:

* List
* List

Which creates a bulletpointed list.

==Category==
===Subcategory===
Text here. Reference to another page about [[Oranges]] here.

I've edited a wiki before, but not wikipedia...

I love this: The Wikipedia article on how to edit a Wikipedia page

Well, even better

I've made some progress on the Wiki already

It'll be brilliant for the new players