Brand new service that shows you when someone unfollows you on Twitter. It tells you who unfollowed you, and what your last tweet was when they unfollowed you.
It could be useful because then you can figure out if certain Tweets of yours really annoy people - and you can stop doing that.
On the other hand someone like me who takes things personally is probably just going to get bent out of shape. Today some woman unfollowed me after I posted this: "And I was all excited to fill up my big monster truck with gas at $3.15.Curses.Coulda saved 25 cents a gallon times 28 gallon tank"
She has a thing against trucks? She doesn't want to hear about gas prices? Fine, just fine.