It's been quite a while I wrote about Twitter, in the context of micro-blogging and Ruby on Rails applications.
http://sumanthtechsavvy.blogspot.com/2008/07/websites-weblogs-micro-blogging-what.html
http://sumanthtechsavvy.blogspot.com/2008/07/twitter-whats-truth.html
I thought it's worth to maintain a separate blogs, to collect the fast releasing applications based on "Twitter".
I welcome your suggestions to list the applications. Mail across the twitter app that you are using/noticed.
http://appsontwitter.blogspot.com/