Unexplained Mysteries has been around since 2001 and the forums about that long, so you can imagine how much content is there. This particular forum is one of something like 50 forums on this website.
If you’re looking for something in particular, you can search by tags, by either scrolling through the forums or looking them up. Of course, not everyone on this website is an amazing speller, but for the most part it works. For example, a search of the term “tarot” yields quite a few results, including from the blogs. I was just reading an interesting little piece on the dark side of the Cups suit of the minor arcana.
Of course, the forum is not without its share of trolls, though the regular members seem to make quick work of shutting them down. Overall, this is a very supportive, very informative and informed group of people who cull information from many different places to help each other out.
The stuff that goes under the psychic phenomena forum is pretty extensive. There’s posts on synchronicity, astral projection, clairvoyance, and the like. There’s a good chance that if you’re actually looking for something outside of this extensive coverage, you’ll find it, too. While you may have trouble getting your footing because the forums are so extensive, people are generally friendly and accepting of new forum members.