Dr. Uwe Girlich updated his Demo Specs page with new versions of a couple of his comprehensive demo utilities:

• Version 3.2.5 of the The Little Movie Processing Centre, a utility to handle Doom, Doom II, Heretic, Hexen, and Strife LMP files; Duke Nukem 3D and Redneck Rampage DMO files; Quake DEM files, QuakeWorld QWD files, and Quake II (client and server recorded) DM2 files.
• Version 1.0.4 of The unofficial QWD format description.
• Version 1.0.6 of the Miscellaneous demo related stuff (MULDER multi-level DM2 file repair corrected).
• And finally, version 1.0.8 of The recording FAQ is now out, explaining all of this stuff.

Dr. G also passed along the following about duplicating his prodigious efforts at doping out the innards of demo recording in the future for Quake III Arena (this is a reference to how the data provided by his work can possibly be used by those looking to exploit the game code):

I would like to use the opportunity to make clear that I wont publish any information on the upcoming Quake 3: Arena demo format without an (at least half-) official approval of id software. This may harm the movie community but whoever heard the (leaked) interview with John Carmack (2nd file, last 15 minutes) knows about the problem. I wont risk any legal consequences.