I have recently installed Wordpress and have added the ping list and changed to SEO friendly urls and done a few posts.

I see these Web 2.0 icons displayed on other blog posts, do I need to register with each Web 2.0 site and push my own blog posts a bit. Any ESSENTIAL plugin suggestions would be great as well.

I really want to make the best out of all the Web 2.0 stuff out there. What is the best way to use Digg, Technorati, Reddit, StumbleUpon, del.icio.us and others??

Also, what is the best way to link back to my ecommerce site that I am blogging about, shall I use a permalink or have a link in the title somewhere?

Thanks in advance