Today, I received an email, a very weird email, titled with a single word "blog", from a very weird person, with the following message in the email:
please update your wordpress installation. it's not secure.
Whoever that is, thanks for reminding. Wanted to do it long time ago, but too busy. Although you sounded like a hacker who would hack my blog if I don't upgrade, but anyway, thanks again.
Upgraded to version 3.0 now, but didn't notice much changes in the user interface from back-end. Shall spend some time to explore soon.