Someone suggested that one good way to use this site can be to study books together, and post any questions from those books that we may have.
Bhante Yuttadhammo suggested here that, this month, we could read Good Question Good Answer:
Out of the suggestions, I'd like to recommend we start with Good Questions, Good Answers, even though it didn't get the most votes; it is freely available online, it is not directly related to any one Buddhist tradition, and because of the format, it fits well with the Q&A framework. Some of the other suggested books, while interesting, are either directed to a specific school of Buddhism or are not free online.