Pwnboxer seems to have been left alone for a while. The author has taken up a different product which has the site, multiboxing.com redirected to that new site. It used to be a good alternative for multiboxing discussion but over the course of a year or more, the owner decided to redirect all his focus. I do hope he puts out an update to pwnboxer, many people still are using it and don't want to change having used it for so long. But thats up to him though.