How to Import, Export, Using Tools Section on WordPress - Brief Explanation of Tools
http://www.syamsulalam.com/newbie-sec...
For you who want to know more about wordpress technical details and being rather expert on it, I suggest you to go to link above.
Anyway, this short video will show you what is import, export, and everything in tools section in wordpress. It will enable you to import your blog to new blog or export your existing blog to new one.
Hope this help, folks!