"The scientific process of asking questions and seeking answers serves as the foundation of the Institute for Inquiry®. The Institute provides a variety of workshops, forums, and resources to support an international community of scientists and educators dedicated to developing innovation and leadership in science education." This website includes self-directed workshops for educators to work through.
The interest in inquiry-based learning seems to ebb and flow based on-well, it's not clear why it ever ebbs. In short, it is a student-centered, Constructivist approach to learning that requires critical thinking, and benefits from technology, collaboration, resourcefulness, and other modern learning skills that never seem to fall out of favor themselves.
This website encourages a teacher to develop"a Questioning Toolkit which contains several dozen kinds of questions and questioning tools". It also classifies and gives many examples of question that lead to learning.