Head over to the ZDoom page for a rather lengthy list of recent changes and fixes Randy has made to ZDoom for the upcoming release of 2.0.48/2.1 (that's a very complex number). Changes and fixes include stuff like minor Hexen issues and additions of multiplayer safe scripts and things like increased range for bullet tracers. Oh yeah and:
Sorry, I want to get through more of the bugs before releasing anything.
Ah well. Also the previous update before that one has the release of ZDoom's internal nodes builder as a stand alone util you can use on your maps, both Hexen and Doom formats.