1. SEO- search engines love fresh content on your website. It gives the search engine text that it can index, every time you publish a post to your WordPress blog you are feeding the search engines. Make sure to include your keywords in your posts.
2. Easy - With WordPress it is easy to keep your site up to date. I often see websites with outdated company information, for example listing an old, inactive telephone number or mailing address. Well, with WordPress there is no excuse for that. Once your site is up and running, changing text info is as easy as writing an email or creating a Microsoft Word document.
3. WordPress Themes- WordPress themes are essentially graphic templates. With WordPress you can, with relative ease, change the look of your website. There are many free WordPress themes as well as premium ones. You can get free WordPress themes at: http://wordpress.org/extend/themes/ although there are many benefits to using premium themes over the free ones.
4. WordPress is an Open Source Software- Free is good (at least some times), it doesn’t cost you anything to download and use WordPress. You can download WordPress by visiting http://www.wordpress.org
5. Plugins- Although WordPress is super powerful just by itself, you can add tons of functionality to it by using plugins. Just like themes there are lots of free plugins as well as premium ones. Here is a link to the WordPress Plugins page http://wordpress.org/extend/plugins/
6. The WordPress community- This is a knowledgeable, helpful, responsive and generally awesome user community. You can post any WordPress question to any of the many online communities and get a response fairly quickly. Most WordPress folks like to share their knowledge.