I just installed wp locally on my computer, in order to configure it and create some content before I put it online.
At some point, I had to change the local domain name wp was running on. That's where I realized that it would break the site down, since the domain name is present in the guid field of posts. This is a big problem to me, and I decided not to use wp because of it.
Feature request : Store the domain name in a global variable, and only there.