[donatj]

I am by no means a Wordpress expert, but I have had to deal with moving clients sites from time to time and I have vivid memories of hardcoded absolute file system paths in the database embedded in serialized PHP that broke when trying to move their installation to a new server with mildly different pathing.

[photomatt]

Migration is horrible right now, making it better is part of the Data Liberation focus this year.

[k3vinw]

If I recall correctly, it was double the fun when it points to the original copy of your other wp install while it’s still running.