Ask H2G2: This is a place where you can ask other users any question you like and have a go at answering the questions of others yourself.
SEx - Science Explained: This is the forum to pose tricky questions about the way the world works, and to put forward some theories of your own.
Games Room: This is exactly what it sounds like - a place for playing puzzles and word games with other H2G2 Researchers.
How Do I...?: Find a different kind of answer. If you want to know how to do something - anything - ask away.