If you use Adobe Illustrator a lot this might be handy for you. You can do multiplication, division, addtion and subtraction within the app:

As the screenshot shows above, I have a 10mm box and I want to increase its width by 2. So in the ‘Width’ field I simply type in ‘10mm * 2’ and voila. Granted this is not that usefull for a simple operation like this however, if you find yourself often using decimals (e.g. the golden ratio) this is a time saver.
Quick tip for people who use Coda for development and like their code to look clean and organized. Have you ever pasted in a snippet of code with tab spacing that’s out of sync with its surroundings?
Those <ul> and <li> tags are way to far to the right. Previously, I would have wasted so much time aligning them one-by-one. Then, by accident, I discovered that you can adjust the tab spacing of multiple lines at the same time.
Simply select the line that you wish to align and hold down Command + ] to tab them over to the right and Command + [ to tab them over to the left. You’ll end up with nicely formatted code: