Yesterday, Mojang released a new version of Minecraft: 1.7.4. They appear to have released 1.7.3 at the same time, but it's difficult to understand why anyone would want to upgrade to a version that's already out of date. As usual, there was no proper announcement of the new version.
The new version fixes a few bugs and adds the ability to broadcast gameplay via Twitch.tv.
The JDRGaming Minecraft server has been updated to version 1.7.4.