With the usual lack of a proper announcement, Minecraft 1.6.2 was made available on July 8, 2013. The new version fixes a large number of bugs, many of which were introduced in version 1.6.1. The related Minecraft News post lists notable changes in 1.6.2, while the (unofficial) version history in the Minecraft Wiki goes into a lot more detail. Version 1.6.2 of the client requires the new launcher.
The JDRGaming Minecraft server has been updated to version 1.6.2.