Hi Asad, you could do something like this to keep the blog right pane from being extra large when not necessary:
.blogcenter-rightnav {width 95%;}
.blognavright { width: 5%;}
You can also remove the float:right from .blognavright, and the RSS icon will appear above the blog.
I'm getting better at CSS every day, and it's all thanks to mojoPortal!