Now the of the total member of Yuwie is not more than 70000. So you still have a chance to get a lot of referrals.

The best way to get more referrals for Yuwie is to post your referral link to Social Networks like MySpace,Face book and popular forums.Other ways are to post free classified ads.
Here they are:

Craig's List
Nation Wide Newspapers
INETGIANT
Classified Ads.com
US Free Ads
Ad Land Pro