G-Defend sites are few and far between, but here are a few that I've noticed on the web.
The publisher's official homepage, with a diary for Morimoto-sensei.
A nice collection of cover art and descriptions of Morimoto-sensei's other series as well.
A fansite with a good deal of information and lots of cute graphics.
A Chinese site with a great domain name. ^_^
A Owl Report
A Morimoto-sensei fansite with scans from Racish Comics. In Chinese and English.
The Senshi Academy
Plug! Our main site.