This must be common question between Allwin, Aseem, Brajeshwar and Megha. They were posting the comments here but my blog was not displaying them. So what was wrong? I had Akismet disabled too.
Well, there is some kind of bug in WP or Akismet which flags some comments as spam, i.e. even after Akismet is set to disabled mode. Due to this, it does not show these comments in the WP Admin area too. So today I checked it in PHPMyAdmin and found about those comments flagged as spam. So, after enabling the Akismet, I could see all those comments waiting for moderation under Akismet’s moderation queue. Marked them as non-spam and now I can view those comments.
Sorry for the mess up guys, sometimes it takes time to understand these kind of problems.