Note: everything here is taken from public sources. If you have more information, it would be welcome, but please send a public URL to be cited.

The usual progression is roughly:

• Query
• Proposal
• Contracted
• First Draft (usually the first announcement)
• Revised Draft (sometimes)
• Playtesting/Review
• Final Draft
• Editing
• Layout
• Rough PDF (no art, boxquotes, etc.)
• Production PDF
• Prepress
• At the Printer

• After the End 2: The New World (PDF)
  (by Rev. Pee Kitty)
  201202 rough PDF being reviewed [source]
• Discworld RPG Second Edition (print)
  (by Phil Masters)
  201202 final draft 21.7% edited [source]
• Hot Spots: Constantinople (PDF)
  (by Matt Riggsby)
  201202 rough PDF being reviewed [source]
• Locations: Medieval Cathedral (PDF)
  (by Michele Armellini)
  201202 final draft in [source]
• Martial Arts: Technical Grappling (PDF)
  (by Doug Cole)
  201202 being edited [source]
• Thaumatology: Ritual Path Magic (PDF)
  (by Rev. Pee Kitty)
  201202 being compiled [source]
• Transhuman Space: Wings of the Rising Sun (PDF)
  (by David Chart)
  201202 rough PDF being reviewed [source]
• Underground Adventures (PDF)
  (by Bill Stoddard)
  201202 revised(?) first draft in [source]
• Worminghall (PDF)
  (by Bill Stoddard)
  201202 rough PDF being reviewed [source]
• Dungeon Fantasy 15 (PDF)
  (by Peter Dell'Orto and Sean Punch)
  201201 rough PDF reviewed [source]
• High-Tech: Adventure Guns (PDF)
  (Wild West and Victorian-era firearms)
  (by Hans-Christian Vortisch)
  201201 reviewed [source]
• Power-Ups 4 (PDF)
  (by Rev. Pee Kitty)
  201201 production PDF reviewed [source]
• Power-Ups 5 (PDF)
  (by Sean Punch)
  201201 adding art [source]
• Banestorm: Martial Arts (PDF)
  (by David T. Moore)
  201112 being reviewed [source]
• Locations: Hellsgate (PDF)
  (by Matt Riggsby)
  201112 rough PDF [source]
• After the End 1 (PDF)
  (by Rev. Pee Kitty)
  201111 rough PDF reviewed [source]
• Third Horror support pdf (PDF)
  (by Kenneth Hite)
  201109 being negotiated [source]
• Loadouts: Low-Tech Armor (PDF)
  (by Dan Howard)
  201107 first (?) draft in [source]
• Ultra-Tech Weapon Tables (PDF)
  (by David Pulver and Kenneth Peters)
  201106 preview PDF being reviewed; in prepress [source]
• Vehicle Design (PDF)
  (by David Pulver)
  201106 First draft [source]
• Madness Dossier (may be one of the planned Horror support PDFs) (PDF)
  (by Kenneth Hite)
  201105 unknown [source]
• Second Horror support pdf (PDF)
  (by Kenneth Hite)
  201101 being written [source]
• High-Tech: Infinite Weapons (PDF)
  (Weapons that never made it to production)
  (by Hans-Christian Vortisch)
  200811 being worked on, no target date [source]
• High-Tech: Modern Firepower (PDF)
  (Firearms from the 1980s onwards)
  (by Hans-Christian Vortisch)
  200811 being worked on, no target date [source]
• Armorer (PDF)
  (Weapon design system)
  (by David Pulver and Hans-Christian Vortisch)
  200709 being considered, no target date [source]
• Girl Genius (unknown format)
  200404 announced [source]