jadz.com is Joe Adams’ personal domain.
jadz.com was first registered on the 3rd of June 2001 while looking for a short domain that somewhat represented Joe Adams. You can view the historic content of this site through the archive.org service. jadz.com originally ran the b2 blogging software before blogging was a common term. Since then it has been upgraded several times and now runs WordPress, the software that b2 has developed into.
The four letter domains have not all been taken, but ones that you can pronounce are hard to come by. I posted in this posting why I chose jadz.com and not jda.com (100% of three leter domains are currently registered).