The [README](http://www.dragonflybsd.org/cvsweb/~checkout~/src/nrelease/root/README?rev=1.22) on the cdrom tells you most.

[The Handbook Install](http://leaf.dragonflybsd.org/~justin/handbook/install.html) is the basic install guide.

The [FreeBSD 4.x upgrade procedure](http://www.dragonflybsd.org/docs/upgrade-freebsd.cgi).
DragonFly only supports upgrading FreeBSD to DragonFly 1.2. From 1.2 you can update to 1.4.

[Justin's quick start](http://leaf.dragonflybsd.org/~justin/new-bsdusers/article.html) guide for the experienced or impatient.

This [Installation Guide](http://www.scottro.net/dfly/dfinstall.html) is a bit more current than the handbook's, and includes screenshots.