I'm thinking of starting a new directory using PowerSeek SQL. WSN links has been giving me some trouble because the expiration thing (which I use) seems to accelerate. So if I tell something to expire in 9 days to give people time to pay, it usually expires in 3 days or less. Upping the number of days doesn't help either. Of course the major flaw with WSNlinks is the support system...
http://www.seo-search-engine-ranking.com/ad_network_222.php