Well that is an irrelevant post title, but I figured NickW would like it. :)

Online dating. Hyper competitive. Too many sites. etc etc etc. But you can still get links and traffic by approaching the topic from a different angle.

Desparate Dating is a good example of that.

The site might be absolutely offensive to a ton of people, but that site will likely get links from BOTH people who like it AND people who hate it. The site is equally unique and offensive, which is something that is oh-so-easy to link at.

One well known search engineer in the past also recommended creating a grammar nazi site that went around fixing everyone's borken grammar and linking back to the home site.