As far as the philosophical issues with it, I think Thomas Nagel hits a number of very good points in Mind and Cosmos. He talks a lot about how difficult it would be to trust our faculties fully given a purely naturalistic origin, which is something I think many people don't take seriously enough. The intelligibility of the world is something he focuses on, as well as our ability to reason with objectivity. Not in the sense that people are without bias, but that we are able to recognize when something can be objectively true or false independent of whatever we personally believe; and that we can conceptualize things is something else that can be used in argument against it. I'm happy to find and post some quotes if you like since it would be hard to really provide a full on, comprehensive post which included the best philosophical arguments against materialism that I'm aware of... I'm really busy right now or I would be able to elaborate more fully.Can you flesh out the text I've bolded?
In terms of PSI, I must admit that I'm not familiar enough with all of the research to make a significant claim one way or the other with regards to it favoring or not favoring materialism. I do think that in terms of evidence there is no shortage of things that challenge materialism, such as, like I said earlier, the Stevenson and Tucker studies. I've yet to see an argument that comes remotely close to making sense of those studies materialistically.