I just wanted to give a big thank you to @ryan for making Processwire and making it so easy to use. We are going through a domain name change for our organization and it was SO easy to make the changes in Processwire. Just a little change to a config file in Processwire (and Apache) and it's done. Everything is working fine. All the internal links (and images, PDF files, CSS, JS, etc) still work with no intervention on my part.
Maybe it's that easy in WordPress or one of the other 'big' CMS programs, but I doubt it.