I agree that psychic powers haven't been exploited as much as they could be yet. I think this is going to be implemented in the 4th Edition revisions. The Space Marines have a good set of powers given their whole lives are combat. Tyranids are also well done. I predict that the coming codexes will continue the trend.
For those who are interested, here is a thread I made concerning Night Lord powers:
http://www.librarium-online.com/foru...ic-powers.html
Or just skip down a little in Rules Development.