Please submit only sites on topic. Otherwise you'll waste your time and my time.

The link back rule: place my reciprocal on a page which is not buried deep in your site structure. Reciprocals placed on mainpage are always very appreciated. Placing my link on a page like domain.com/dir1/dir2/ is not good.

Do not forget to register and send articles. You can put a link to one of your sites in the article you submit. Since the web interface doesn't allow you to do this you have to write your url and anchor text at the end and I will link it for you.