For anyone who may be on the fence with this subject, I have some powerful literature for you:
Should I Use WordPress To Create a Website?
Hmm, still not convinced? Alright, here is a slightly more thorough article:
Why Power Your Small Business with WordPress?
In all seriousness, I have been involved in web design and development since 1998 and in the past 12 months I have centered my entire web development process around WordPress. Hands-down, it is the best and most user-friendly (and FREE!) Content Management System (CMS) I have ever used. This is why every site I make is powered by WordPress.