If you go here and do a find for 042-68 you'll see what purports to be the first part of Barack Obama's Social Security Number. According to the Social Security Administration, the 042 prefix indicates that the number was obtained in Connecticut: ssa.gov/employer/stateweb.htm
Obviously, there are a lot of open questions here, and even if that is his real number what exactly it would prove isn't clear.
The person who generated the list of names, addresses, and SSNs is apparently Neil Sankey (privateinvestigation.com), a former British policeman who's now a licensed private investigator in Los Angeles. A search here will show he has a clear record (actually, there are two records, one clear and one delinquent, with the latter probably just due to an address change; the clear one cancels out the other one).
If anyone can find some corroboration that that's really Obama's SSN, please leave a comment. Perhaps this is the real reason why he's so adamant about not releasing his college transcripts and the like.
UPDATE: As of late July 2009, this post is getting a lot of visitors. Could someone leave a comment explaining who mentioned this and when and where? Also, please see the Obama citizenship page for our extensive coverage of the wider issue.
Independent, in-depth coverage of immigration, politics, and media bias since 2002. Also: multiculturalism, Los Angeles, California, privacy, and occasionally celebrities and wacky humor...
If you can't find what you're looking for, see the About page or use the navigation features to the right.