Browser tools
Enhance your Reddit pages with image search links.
each post listing
submission page
Bookmarklet
Use when viewing an image or page on imgur.
Use on Reddit post listings, comment pages, submission page.
User Script for Firefox
Requires the Greasemonkey add-on.
User Script for Google Chrome
Note: Chrome will warn you that the script can "access data on all websites". That is Chrome's generic warning for any user script. Reading the code of the Karma Decay script will show that it runs only on Reddit and only adds links to Karma Decay.
Firefox Add-on & Chrome Extension
Both will be created very soon.
The front page will contain an announcement when they are ready.