You can see 7 Plugin killer plugin on youtube and you can all free download for strategis on the your blog
7 WordPress Killer Plugins: Episode 4
http://www.youtube.com/watch?v=2F_ev8Od-eQ
7 WordPress Killer Plugins: Episode 5
http://www.youtube.com/watch?v=gxTCoigji_M
7 WordPress Killer Plugins: Episode 6
http://www.youtube.com/watch?v=qRr4-9X6O6w
7 WordPress Killer Plugins: Episode 3
http://www.youtube.com/watch?v=_vrLTEjHP34
7 WordPress Killer Pluins: Episode 1
http://www.youtube.com/watch?v=BXkFQhrKBm4