Last Saturday I added a "Blast From the Past" feature to my blog which will highlight a post from the past that garnered a lot of views or one of my personal favorites. Above this feature, (not new, but handy!) you can enter your email address to receive new posts in your inbox.
Also not new, but just as handy, is a "Search this blog" feature. As blogs grow, it get really hard to find a post. This let's you search for a keyword. Any post with that word will be displayed.