Thank you to Jay Dolan for his massive involvement in this release, bringing us MacOS X support as well as Quake 2 support. And thanks to all the testers on QuakeNet #radiant irc.
What's next you ask? We will probably scan through the issues list and build a hit list of things to look at for a 1.6.5 release.
You are encouraged to run this latest version and if you experience any issues, you can report them here or on the IRC channel.