Moving wp from subdomain to root

Hi
I have been building and developing my wp install on a test domain
ie http://www.domain.com/beta

I have now got it all working and heavily modded as required.

I now need to set it live to replace the static website at http://www.domain.com

I would be really grateful if anybody had a guide on this to ensure there are no issues and so that all pages will be in the format http://www.domain.com.about

Thanks in advance