The main limitation if a wordpress blog is that we can not add widgets and JS code in it when we make a free blog on Wordpress.com.So i decided to move my blog from wordpress to blogger. Read complete post regarding.... How to move a wordpress blog from wordpress to Blogger.. http://emergingseo.blogspot.com/2009/02/moving-blog-from-wordpress-to-blogger.html
Why not just self host and do what ever you want, when ever you want ? The more you blog, the more you will be come frustrated with the limitations of free hosted blogs..as you are starting to see. Not to many people go from free bog, to free blog, they usually go from free blog to self hosting. JMO