A bookmarklet is normally some JavaScript that you save as a bookmark that will let you apply that JavaScript to a particular page.

Here will be a growing list of bookmarklets that I use regularly.

Getting coordinates from Google Maps

Code:

javascript:javascript:void(prompt('',gApplication.getMap().getCenter()));

Use Case:

When you are attempting to get the coordinates of a location, you can use Google Maps to find the location and click on this bookmarklet, it will alert the coordinates onto the screen.

Originally From:

https://groups.google.com/a/googleproductforums.com/forum/#!category-topic/maps/base-map-data/Vp90rs-mZCE

Creating Wireframes from websites

Code:

The code is all on the official website.

Use Case:

When you like the look of a design but want to almost reverse engineer it into its basic parts.

Originally From:

http://www.wirify.com/