I have OS 4 Beta 3 running on my iPhone 3G and I have noticed that throughout all of the Beta's my phone has had a problem remembering the Password to my Yahoo Mail account. It will randomly say that no password is entered, I go into setting put it in and then an hour later it is gone again. Im assuming this is just a 4.0 glitch because my gmail account works fine, but if anyone knows something I do not please let me know