The latest bleeding edge version can be found in the Gnome SVN tree.
version 0.96.1 (29/3 2007)
version 0.95.1 (26/5 2006)
version 0.94 (19/8 2004)
version 0.93 (1/5 2004)
version 0.92.2 (1/11 2003)
version 0.91 (14/3 2003)
version 0.90 (1/6 2002)
version 0.88.1 (12/5 2001)
version 0.86 (6/8 2000)
version 0.85
version 0.84
version 0.83
version 0.82
version 0.81
version 0.80
version 0.41
version 0.40
version 0.30
version 0.20
Version 0.12
Version 0.11
Version 0.1
Binaries
Debian packages of Dia (latest version)
Up to date RPMs for various distributions can be found at Ximian.
Up to date packages can also be generated from the source by running "rpmbuild -ta dia-*.tar.gz".
The dia installer for Win32. A dia version for Windows.