Plugins to clone wordpress site and move to another url

Are there any possible plugins that could clone an entire WordPress site and install it in another location?

I build sites on one url, then to show the client and move it to another url to show it.

At the moment copying the files and database and re-uploading everything and changing urls is a bit of a nightmare!

UPDATE:
I want them to run off two different databases.

There is extensive question/answers for moving from development to produciton in general Easily Move a WordPress Install from Development to Production?

However for your specific question best plugin that I know is commercial BackupBuddy. It packs whole site (including WP itself) and can restore it to different URL.