RSS and Javascript
It appears that the blogrolling RSS code now requires Javascript, and so will not work on wordpress.com blogs. You can still subscribe to the most recent posts RSS feed.
The feed URL for the most recent posts is http://www.energionpubs.com/wordpress/?bdprssfeed=1
If I remember correctly I set this up for the most recent 50 posts, so you can choose any number you wish. The standard wordpress widget will do up to 10 which is what I have in the sidebar here.