Picture of a 1961 Hawaiian long-form "Certificate of Live Birth"
By now everyone knows what Barack Obama's supposed "Certification of Live Birth" ("COLB") looks like. Now, compare that to the long-form "Certificate of Live Birth" pictured in this post and available in a slightly larger form here.
Note that, as with the other form here, it contains much more information including the names and signatures of the physicians. The pictured certificate was for twins, both of whom were given serial numbers lower than the one that Obama apparently received, despite being born the day after him.
The mother of the twins speculates it might be because she went into the hospital earlier, and WND adds that it might be because certificates were assigned numbers from different hospitals in batches.
However, as with other issues involved in this matter, no one seems to know much.