Because of something one of my blogging friends wrote, I added a subscription button. It was a lot of work, mainly because I am clueless and often don't see what is right in front of me. (I just said that so you will feel sorry for me.)
So, there is a subscription button on the sidebar. Go ahead and subscribe! Then you don't have to check back to see if there is new content* - you'll get email letting you know.
Unless, of course, you want to check the Astronomy Picture of the Day anyway. Or should I go back to the puppies?
*OK, assuming you think there is ever real content.