Handy, and easy to use - and updated rapidly!
I've found this very handy many times, especially since the recent update. I use it to keep track of the total cost of items I've put in my shopping basket. It's quick to open up, so I use it whenever I just want to add some numbers and see them all listed. I don't always want to start Excel, even if I'm sitting at my computer. But my iPod Touch is always with me, so I appreciate this little app!