How can i find keywords for my site which can give actually conversion??

Here is a list of top Blogging Communities
<!-- m --><a class="postlink" href="http://blogengage.com/">http://blogengage.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://blokube.com/">http://blokube.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.bizsugar.com/">http://www.bizsugar.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.bloggers.com/">http://www.bloggers.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://blogster.com">http://blogster.com</a><!-- m -->
<!-- m --><a class="postlink" href="http://dosplash.com/">http://dosplash.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.fuelmyblog.com/">http://www.fuelmyblog.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.gather.com/">http://www.gather.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.indiblogger.in/">http://www.indiblogger.in/</a><!-- m -->
<!-- m --><a class="postlink" href="http://inbound.org/">http://inbound.org/</a><!-- m -->
<!-- m --><a class="postlink" href="http://klinkk.com/">http://klinkk.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://kingged.com/">http://kingged.com/</a><!-- m -->
<!-- m --><a class="postlink" href="http://list.ly/">http://list.ly/</a><!-- m -->
<!-- m --><a class="postlink" href="http://managewp.org/">http://managewp.org/</a><!-- m -->
<!-- m --><a class="postlink" href="http://triberr.com/">http://triberr.com/</a><!-- m -->

Twitter is making direct messages for user friendly. The DM's will be more consistent across web and mobile.

I was just wondering that i see some bloggers who writes a blog one or two every day for their blogs and still got many ideas for guest posts too. How they get time and idea to do all of it.

Currently, in my google webmasters tool i am getting too many messages for 404 errors. When i tried to find out that which pages the google crawler is having problem to crawl, i see that the pages don't even exist. What should i do?? Does it going hurt my Google rankings??

Can anybody suggest good CPA tracking software?? so i can track the engagement, ctr rates and also the conversions.

Can anybody provide me some suggestions about how can i get more and more traffic form USA to my site??

Can anyone define Panda and Penguine?

If i bring a huge amount of referral traffic instead of search traffic to my site. Then is it good??

Can anybody throw me a review of All Media Ads? It is a new network and i don't know that it is trustworthy or not.