Hey anon101, seems that we are in a similar boat! I didn't hear back from Stanford by the Feb 3rd due date, and contacted them on the 6th to inquire about my application status.
They said I should have received an email and I probably have changed my email address, to which I said I hadn't. I was asked to wait till the next day, and two days later, after I sent them another email, they "resent" me the rejection letter. Seems a bit weird they missed me in the recipient list on the 3rd Feb. I guess if we had not inquired, we wouldnt have heard back from them.
Got into MIT, Princeton and Berkeley so I still have plenty of great options to consider. Just didn't expect Stanford to miss sending such an important email that can be potentially life-changing.