You forgot something : ADULT GAMES
If you want to increase site retention adult games are the best tools, people will get addicted playing the games and they also love to see their name on the top10.
you can setup contests giving away prizes like t-shirts, mugs, monthly memberships, signed photos etc etc..
We develop premium full customizable games - basically everything can be changed in the games: content, interface, preloader logo, help text, games rules... all external jpg and text files loaded by the games on the fly. so branding the games to fit your site needs takes few minutes.
Signup the demo request form if interrested and I'll send you a demo account in minutes
Don't hesitate to contact me on icq - 16361223 with any questions you might have.
Cheers,
FF