A couple Psychology specific apps are:
StudySets – Psychology
PsycExplorer
I haven’t used either of those, so read up a bit on them to see if it is something you’ll find useful.
Another app that is amazing for anything note taking related, is Evernote . It is free & is available for both mobile devices & computer.
An app that may prove to be more useful than expected is the official Wikipedia app, Wikipedia Mobile May come in handy for those quick searches that take too long to do manually on the mobile devices browser.
Don’t forget about the unsung heros of iTunes, the iTunes U department. They have excellent resources of information, all for free!!
Psychology – Yale Faculty and distinguished guests speak on psychology research and latest studies happening at Yale.
Psychology – Cornell psychology programs draw on faculty from departments across the university including Psychology, Human Development, and Neurobiology and Behavior.
Psychology 140, 001|Spring 2010|UC Berkeley – This is the Psychology class at UC Berkeley being video recorded.
Hope these are of some help. Good luck at University.