This plugin Is an exact match domain tool.
It will check keywords to see if the domain are available.
It is a simple tool but a time saver.
It also has a option where you can add your godaddy/namecheap affiliate link.
If the vistor clicks through to buy the domain, it will be through your affiliate link.
Requires WordPress Version:
2.9.2 or higher
Compatible up to: 3.2.1
Last Updated: 2011-10-26