You can use it, for instance, with commands like the following “Alexa, ask Speedlighter for the latest post”, and have the most recent blog post read to you. Not every post on the blog lends itself well to dictation (some depend heavily on images, like Picture of the Day, or some exposure lessons), so blog posts in the “Audible” category will be read.
New features will continue to be added, and it will be available in the UK soon as well. To readers outside of the US, as Amazon releases the Echo in more countries, this will become available in them.
Have fun, and let me know how it works for you!