I have added "share this" plugin by Alex King. It worked like a charm, but even since I have installed Misty Look theme (http://wpthemes.info/), this plugin does not work correctly for me. The share this menu that should appear on top of the content layer is sent behind the content layer - so naturally it's not visible except for the bottom most post on my blog homepage.
changing the theme back to K2 rectifies the problem, switching back to MistyLook - the problem resurfaces... check out the links below to see what i mean to say
blog url: http://www.blog.xvzx.net