A Greasemonkey script that will enlarge and preview image. As you hover your mouse over any images in Google image search result.
Otherwise you will have to click thumbnail to view the full size image. This script will save few seconds of your precious time. 
evil:
Step to install the script.
First you must have Firefox browser and Greasemonkey add-ons installed.
After that install this script, Googlenlarge.
[Via Unofficial Google Trends Blog]
