Live demo – see wordpress.com for lots of sample live sites
Deployment alternatives (In-house, SAAS, VM)
In-house, hosted by WP.org or commercial hosting provider, VM image appliance available
Easy to use
Lots of plugins
Pretty powerful approaches a full blow CMS
Huge community, growing
Great online documentation and resources
Fully Open source
Not all plugins seem to work on my hosting provider. Some are of questionable quality.
General comments from evaluation and other users
Used by tons of people. Highly recommended.