Since I posted, OER Commons has recently been released and has a lot of physics resources (http://www.oercommons.org) from lectures, coursework, textbooks, games, interactive stuff, Khan videos, etc. You can limit the search by age, subject, or advanced search.

Tons of open educational resources on OER Commons from kindergarten to graduate school - including PHeT physic simulations from the University of Colorado Boulder (http://phet.colorado.edu/en/simulations/category/new).