I recently posted my top five WordPress plugins and mentioned in that post that when I come across other useful plugins, I would post about them. Well, here's the first of many!
Let me introduce you to ...
FAQ Manager
As the name suggests, this plugin allows you to manage multiple "FAQs" on your site. I've used this plugin on two sites recently and it just works so well!
After you've installed the plugin, you'll get an extra option in the left hand panel of WordPress to create the different FAQs and groups. It is incredibly easy to use, but powerful at the same time.
Go check it out!