Psi phenomena gets a bad rap often being ridiculed as being unscientific and consisting of woo. The reality is that at least in some aspects of PSI phenomena there is more scientific validity than many of our existing scientific notions.
Dean Radin has done a wonderful job of pulling the peer reviewed scientific articles/research together into one page. The articles are all downloadable, are from 2000 onwards and cover a wide range of topics.
Anyone attempting to understanding human behavior should also consider the effect of PSI phenomena on our daily existence and how it impacts on our larger world. It is not only a good way to gain a sense that there is more out there than meets the eye, but also can give a seeker of self important overlooked areas to be explored.