Nice WordPress plugin I just used is called Duplicator. It let me migrate a site from development to a new production server. I used the free version of Duplicator, and there’s also a Pro version. Only glitch: I had to manually create the database and user on the production server. It looked like the plugin would do that for me, but it didn’t. Could be an issue specifically with the host.
Find out more info and download the plugin at http://lifeinthegrid.com.