Oh look Bob, we're each partially on track.
Something broke when I pasted the link above. It was supposed to include this text, enclosed in angle brackets: a href="http://biznik.com/join/dennis-dilday" at the beginning. (If I put the brackets up here, it creates a crazy link instead.)
This should take your visitors from the Biznik button to the join page that will "credit" Dennis with the invite. This might not be exactly condoned by Biznik "officials" because it doesn't take visitors to the Biznik site overall ... but it's what I have cobbed together for my own selfish motives ;-)
The "invite your friends" link opens your address book in Gmail or MSN or Yahoo ... so you can send invitations to your horde of contacts ...