How to move posts between pages:
Easy, you can’t.
Reading the definition of pages shows that they are just for ‘static’ data – like an About page. You can’t post to a page, so you can’t move posts to a different page. http://support.wordpress.com/post-vs-page/
**For those who host their own wordpress site**, this may prove useful: http://www.maxblogpress.com/plugins/dppp/
On a similar note, here’s a link that talks about the diffence between TAGS and CATEGORIES: http://lorelle.wordpress.com/2005/09/09/categories-versus-tags-whats-the-difference-and-which-one/