This plugin allow you to grab a screenshot of a remote url and save into your own word press media library.
Features
Uses the wordpress.com ‘mshots’ functionality to automatically take screenshots of websites..
Automatically adds the screenshot to the WordPress media library
Redirects you to the edit screen once the screenshot is in the media library.
Once the bookmarklet is installed you don’t even need to copy and paste a url (just navigate to the site you wish to screenshot and select the bookmark).