To get the AS referal link, click on the Help tab. Then scroll down to "Most Common Questions" and click on "I want to refer others!" You will be taken to a page where you can email friends about AS, AND generate a link to include on your web site, in your emails, etc. Just cut-n-paste it.
I have mine as part of my email signature, on my eBay "About Me" page in several spots, and in my yahoo profile.
If you are a seller, just remember it is against eBay policy to put non-eBay links in your auction listings. If caught, your auctions will be pulled.
Good luck!
diva (aka Dag)