Infect and Cure
Infect and Cure is a computer game for anyone interested in medicine. You infect and cure other players using real medicine.
AAMC
The official organization that makes the MCAT exam is the
AAMC. These guys release real, past MCAT questions for practice at
e-mcat.com. It's the best practice MCAT questions you can get.
Student Doctor Forums
Every premed probably already knows about this website. But in case you never visited
Studentdoctor.net, you have to check it out. It's both resourceful and hilariously funny at the same time.