cmdrslog

This extension allows you to save screenshots whenever you refresh a tab for URLs you specify.

You may want to do this for projects you are developing, setting the urls to something like localhost:8000 or your live server.
You can specify separate folders for your projects, as well as a delay in miliseconds before taking the screenshot.

development

I'm using the FileSystem API as described here:
http://www.html5rocks.com/en/tutorials/file/filesystem/

The layout is all done with d3.js

Getting the stored images out of the local FileSystem is the biggest item on the TODO list right now.

local files

if you want to capture local files (like file://localhost/path/to/file.html)
you need to update the manifest and add the following permision to the list of permissions:

"file://*/*"

unfortunately the chrome webstore will not allow this permission to be published