http://www.allnichetops.com/
http://nichetop.com/
http://www.nichetopsite.com/
http://www.nichegallery.com/
http://www.top-resource.com/
http://www.topnudehollywood.com/top.html
http://www.toplistcentral.com/
here's a start... I've got about 400 more links in my bookmarks but I'm not done sorting them into directories yet... I haven't checked any of these out yet so I don't know which ones are the best... keep them on a gateway page like you said...