Creddon - Tweet for a cause and a sponsor will donate $1 to charity
New Tab by Flickr - Get a beautiful photo each time you open a new tab
Send Mail Get Mail - A postcard-sending website.
Exposure New Tab - Get a beautiful photo from Exposure in every new tab
Postacard - Text a photo to send it as a postcard for $3.
Less Boring New Tab - Your browser deserves a better new tab page