ladyTax is a quick and easy tax calculator (see Figure 5). Set tax rates on the back of the widget; then choose a tax rate and enter an amount on the front of the widget. That's all there is to it.
Figure 5 The ladyTax widget.
Why do I like it? It really simplifies the sales tax calculations I do when selling helicopter tours over the phone. I only wish I had to use it more often!
ladyTax is by ladybug. Just be forewarned: The developer's web site is in French.