blogging and seo questions?

1) What are the best blogs to seo your site? I am already on blogger.com and technorati.com do I need anything else?

2) I also have a blog on my website. It is counterintuitive to have two seperate blogs?? I’m so confused on that. One is internal linking and ones external right?

3) random question if I write a good content general news blog by using and metatgging the latest searched keywords will traffic come and actually help me get affiliate income? im interested to know if anyone tried this?

Thanks!!