Qwitter is an online service which e-mails you when someone stops following you on Twitter…
It will then send you a message something like this:
John Gruber (gruber) stopped following you on Twitter after you posted this tweet:
What's the difference between Arial and Helvetica?
Check it out…
http://useqwitter.com/
A friend encoraged me to read this website, great post, fascinating read… keep up the cool work!