Stanley Dunham - mother of Barack Obama - was enrolled in classes at the University of Washington at Seattle that might have started just 15 days after Obama was born. That's revealed in documents discussed here and here by Jerome Corsi of WorldNetDaily. And, that might contradict claims made by Obama in "Dreams of My Father":

In that book, President Obama claimed his mother remained with him in Hawaii until 1962 when supposedly Barack Obama Sr. made the decision to abandon Ann Dunham and Barack Obama Jr. in Hawaii because Harvard did not provide sufficient funds for him to take his family with him to Cambridge, Mass., to begin his studies at Harvard in September 1962.

The classes apparently started in August 1961, but it's not clear to me on exactly which date they actually started (could it have been September instead of August), whether Dunham attended all of the classes, whether she attended any of them, or whether they could have been some sort of correspondence course that wouldn't require her to be in Seattle. However, a local telephone directory dated 1961 did give her address in Seattle (link). It would be very helpful to get clarification on those points.

One slight problem with Corsi's article is the claim that "trans-Pacific travel likely was at a speed half of today's jets". While all the types of planes flying to Hawaii aren't known, United Airlines was offering jet travel starting around 1960 (link). So expect to hear about that as a distraction from the probability that Obama lied in his book.

9/1/09 UPDATE: Per WND

In a video that has been removed from the Internet since the 2008 presidential campaign, Susan Blake, a high school friend of Obama's mother, gave an interview in which she discussed seeing Dunham shortly after Barack Obama Jr.'s Aug. 4, 1961, birth. Blake explains in the video that Dunham visited her in Seattle in a "late August afternoon" when Barack Obama Jr. was only "a few weeks old." ...Blake tells how she showed Dunham, an evidently inexperienced mother, how to change the baby's diaper... The Blake video presents additional evidence that conflicts with the birth story presented by Barack Obama in his autobiography "Dreams from My Father."

I haven't reviewed that segment or looked for a longer segment, but the comment at freerepublic.com/focus/news/2329932/posts?page=56#56 seems to be saying that Blake is not entirely credible. How accurate that is isn't known.