I do quite a bit of my testing in a local environment, and with the serialized data, moving databases got to be a hassle. I found the site below and the tool he has works great. I used it to also move all my image files for the upgrade to V5 so I didn’t have to leave the old folder in place. 🙂
http://interconnectit.com/124/search-and-replace-for-wordpress-databases/