Consider using a Content Authoring System that is web forms based. This creates a simple to use, fast and effective method for creating new content while getting staff to 'buy into' the new technology.

Loosely, usability can be equated with "ease of use" but also includes:
:: how quickly and easily a system can be learned
:: how efficient it is for regular users
:: whether users will remember how to use the system after a break
:: how user errors are managed (and ideally prevented). - CMb 2003-11