OneTab - Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.
New Tab by Flickr - Get a beautiful photo each time you open a new tab
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Exposure New Tab - Get a beautiful photo from Exposure in every new tab
Momentum - Agile goal and performance management
Less Boring New Tab - Your browser deserves a better new tab page