A few things you might want to consider. I noticed you sold merchindise on the site that has you pay by transfering money into that account number specified. Double check that number to be safe, make sure it hasn't been changed. Also when looking at the other sites that group has defaced many of them seem to be running the same kind of services you do. IE forum, postcard. Make sure you have the latest version of that software and apply any patches you might need. I look at the version of phpbb you're running and it currently has exploits available. I didn't go indepth to see what they were, but there are there. Wether or not its relevent to this defacement, you should update them anyways =)
