October 13, 2009 — Matt Mullenweg gives an overview of the GPL and how it benefits WordPress, why WordPress is licensed under the GPL, how the GPL fosters innovation, affects themes and plugins, and creates value.
The directory of premium theme authors who support the GPL as mentioned in the interview is located here.
October 13, 2009 — The new Publicize feature on WordPress.com helps you ping out your blog updates to Twitter and Yahoo and bring your followers back to your blog.
This short tutorial will show you how it works and how to get it set up.
October 9, 2009 — WordPress.com now has a service that will allow you to subscribe and “listen in” on blog conversation using a Jabber-compatible instant messaging client. This video will show you the basics.
October 8, 2009 — WordPress.com users can now insert detailed archives into the body of a post or page. This quick tutorial will show you how to add the archives shortcode, what the results will look like, and what options are available.
There’s also a Support page on this shortcode available here with more information.