Hey,
I've put together an extension for rating articles if anyone is interested. It's just a first version and hasn't been tested much, but the details can be found here:
http://www.wikihow.com/WikiHow:RateArticle-Extension
You can see an example here on our development server:
http://wiki16.wikidiy.com/Get-a-Better-Deal-on-a-Home-Loan
(username password wikihow / wikihow2006) - scroll down to the bottom of the page for the checkmarks.
I'd appreciate feedback if anyone has any. If someone wants to add this to extensions in svn, that'd be great.
Thanks, Travis