Converts all URLs to root-relative URLs for hosting the same site on multiple IPs, easier production migration and better mobile device testing.
Took me awhile to figure out my scripts and styles from CDNs weren't working.
In addition to making page and image URLs local, the plugin "helpfully" made my googleapi references local as well.
So if all your assets are really local, this plugin works great.
If any of your assets are NOT local, you may have issues.