"We will have content there to help people learn about the core concepts behind EA, as well as lots of links to other organisations"
One thing psychological research warns about is the "curse of choice" -- give people too many options, and they end up choosing nothing (or they choose the easiest, as per your "give 1% to Oxfam and they're done" example). Organizing the large amount of information and options available such that no one is scared off will be a difficult but vital task.
Great post. As the father of a daughter in her second year of college, I'd make two quick comments: