r1tz found an old forum post with a puppy release timeline made by trobin..
June 18 2003 Puppy Version 0.1 made available
June 23 2003 Puppy Version 0.2 Able to boot from CD and or USB device
June 29 2003 Puppy Version 0.3 FVWM95 reworked - given Windows like feel
July 23 2003 Puppy Version 0.5 Autodetection of Hardware
Sept 20 2003 Puppy Version 0.7 Not sure why
Oct. 06 2003 Puppy Version 0.7.2 Cdrom Burner
Feb. 01 2004 Puppy Version 0.8 Complete Rebuild - Redhat 8.0
Feb. 14 2003 Puppy Version 0.8.2 Version upgrading, back up to CD script
Apr. 24 2004 Puppy Discussioin Forums Mentions Contributions Made
May 21 2004 Puppy Version 0.8.5 TCK/TL
May 24 2004 Puppy Boot Disk
June 25 2004 Puppy Version 0.9 Complete rebuild - Mandrake 9.2
June 28 2004 Made sources available for those wanting to create own puppy
Puppy fearured on UK - Linux Format magazine
July 10 2004 Puppy Version o.9.1 Printing
Sept 17 2004 New Discussion Forum
Sept 23 2004 Puppy Version 0.9.4 Data Base
Oct. 05 2004 Puppy Version 0.9.5 2 flavours, Firefox & Opera
Oct. 20 2004 Puppy Version 0.9.6 DVD
Dec. 16 2004 Pupget script written by Guestoo
Dec. 16 2004 How Puppy Works page written
Jan. 11 2005 Puppy Unleashed beta version uploaded.
Jan. 11 2005 Smallest Puppy Contest announcement - Must have GUI, Browser, email.
Feb. 21 2005 Puppy built from Puppy Unleashed
Feb. 21 2005 Puppy Unleashed uploaded
Mar. 08 2005 Puppy Version 1.0 Experimental Multisession
Assume that Unleased upgrades have been made.
Mar. 29 2005 Puppy Version .10 Desk top publishing
Apr. 11 2005 Puppy Version 1.0.1 Pup-Get & Dotpup
Apr. 12 2005 John Murga's Operas based Puppy in a 50 MB ISO.
May. 02 2005 New Forum added to replace old.
May. 17 2005 Puppy Version 1.0.2 Kernel 2.6.11.7.
May. 17 2005 Puppy Unleashed 1.0.2 not an upgrade
May. 18 2005 Guestoo released an Unleashed Installation Script
June 09 2005 Puppy Version 1.0.3 Full BASH
June 09 2005 First Barebones Puppy
June 09 2005 Puppy Unleased 2 kernels 2.4.x and 2.6.x
July 19 2005 Puppy Version 1.0.4 Kernel 2.4.29
July 19 2005 Chubby Puppy Open Office Suite
July 23 2005 Mathiesan released Nanowrimo puplet based on Puppy 1.0.3
Aug. 24 2005 Puppy from Scratch page written
Sept 27 2005 Puppy Version 1.0.5 John Murga's Pupget downloader
Sept 27 2005 Puppy Version 1.0.5 Keenard's WAG
Sept 27 2005 Puppy Version 1.0.5 Amanda Singh's PuppyPDF
Oct. 01 2005 Nathan Fisher released Grafpup
Oct. 03 2005 Distrowatch features Puppy
Nov. 07 2005 Puppy Linux Version 1.0.6 Multisession DVD
And a link to old puppy news
http://www.puppylinux.com/news/news2003.htm