Moving my current wordpress blog to a subdomain

Question

I currently have a blog set up on my domain (eg domain.com), but I would like to move it and all of its contents to a subdomain (eg sub.domain.com). Is there anything I need to watch out for or modify? Is there a tool which might do this more easily?

I'm afraid of database issues (it will be using the database instance as it is now) or calls from within the blog itself not resolving.