Advocates are people who help bring people to WinCustomize.com.  Whenever you link to your personal page, an post you've written, a skin you've made, or even a skin someone else has made that you've recommended on your personal page, you get an advocate point when someone visits.  For example, on Neowin I made a post talking about Liquid 2. I did the same on some other sites that linked to Liquid 2.  When someone clicks on that link, it gets counted as a referral which in turn counts as an advocate point.

Users who get more advocate points in a given month than I get often get sent various WinCustomize.com goodies in the mail (though in June, I was #1 which is the first time that's happened since we started doing this).  Thank you to everyone who helps bring people to WinCustomize.com and spreads the word on the power of skinning and customizing your desktop experience!