A tip for capturing your design ideas quickly

One of my new favorite discoveries is a set of printable sketch sheets that I now keep at my desk and in my purse so I can randomly start sketching ideas if they come to me. I've been using the 960 Grid System sketch sheets, of which you can download (in PDF format) at Nathan Smith's Github. You can also download various templates for wireframing in Photoshop, Illustartor, GIMP, Omnigraffle, inDesign, etc.