How do I email my Followers, to let them see my latest post?
People who Follow your blog get a subscription to the blog feed, added to their Following Reading List, and to their Google Reader. Newsfeeds were originally designed to avoid use of email for keeping up with a blog or web site of interest. One of the benefits of Following is the ability to avoid use of email, while monitoring multiple blogs and / or web sites.
Your Followers, if they so chose, may subscribe to the blog by email using a FeedBurner email gadget. Or they may provide you their email addresses, directly, and let you maintain a Google Group fed by BlogSend. But these won't make them Followers, they are just readers who have their picture on your blog.