moving blog posts and comments from old site to new site

Hi,
A client has an existing site at:
http://ruhglobal.com/

I'm doing the redesign for them at:
http://bnmnewprojects.com/ruhglobal/

The client has had some additional blog posts come on the original site and some comments. Is there a plugin that can move the new plog posts and comments to the site I have under construction?