The inital installation process for DragonFly BSD was to install FreeBSD 4.8, import the DragonFly BSD code from CVS, and then build over that system. Relatively time-consuming, especially when hitting the mergemaster step. Now, thanks to the efforts of David Rhodus, you can nab the first installation image.

http://dbsd.catpa.com/drhodus/dbsd.iso

It’s just over 150M.