Hi,
I can't read Tamil. I did go through the "English" section of your blog. I liked the contents.
I liked the Nano image on the front page. Also liked the cartoons, are they your creations? You seem to be really creative.
The theme is good but the widget on the left panel has a lot of contents. You could reduce the number of posts that show up on them for a cleaner look.(I'm assuming it is a list of top posts/recent posts). Maybe you could move the blog adda and other images to your page footer. The first page is really long(you could probably have fewer posts on pages).