Rohit is a colleague. He told me that many a times he has wanted to leave a comment on my blog but put it off because blogger wanted him to register first. He said that is the reason there are no comments on my blog even though quite a few people visit it.
I did a little research and found that it is possible to comment without getting registered. Here's what I found out :
A bit of housekeeping: We've gotten several emails from people having problems posting comments to this site, so we've changed the set up a bit (because we really do want people to comment and discuss). From now on, you don't have to have a blogger account to post a comment -- anyone can post without registering for anything. In the comments section, if you don't have a blogger account, just select "other" instead of "blogger," then fill in your name (and url if you have one). Or you can choose "anoymous" if you must, but we hope you'll all ID yourselves in some way ... So comment away!
This above option became visible only after I went to blogger settings, comments tab and changed the value of field "Who can comment" from registered users to anyone.