This (free!!!) extension is just great, and what any webmaster needs if he is interested in feedback.
I miss just one feature. I have many articles on my site. Most of the older ones do not need to be commented upon anymore. So, I think an option 'only for new articles' or 'only for articles created after xxx/yy/zz' would come in handy.

Twitter Status is a great plugin and indispensible when you want to twitter your items from your Joomla website. Installing on my site was a bit a problem, but Tomasz's service was incredible. Highly recommended!