A lot changes has occured on www.linkstraffic.net and now you can submit your site (different offers) then submit additional pages and other sites for free depending on the category. Linkstraffic also features an affiliate program for those who are interested...
You may want to get rid of your adult categories, as Google frowns upon adult related content with adsense.
Well, I guess I'll manage something about it, I already thought about that issue. Thanks for reminding me that. About the signup form, I'm also thinking about making it as an option. Thanks too.