Recently my friend GiriRaj started a Tamil blog called "MANASAATCHI"
He is started to write various articles in his blog with tagging. I know him for the past 8 years. Earlier he used to send mails to all, later he created yahoo groups and started to send mail through that. Now he started his own blog. Really lot of improvement in him. The articles are in plain tamil so that every one can read and understand. You can find some interesting articles in it.
