Hi there
Here are some pretty good links which explain everything, including why the certificate number is blacked out. Factcheck.org has a photo of the thing without it being blacked out, and the number is 151 1961 - 010641.
http://www.factcheck.org/elections-2008/born_in_the_usa.html
http://www.snopes.com/politics/obama/birthcertificate.asp
http://www.politifact.com/truth-o-meter/article/2008/jun/27/obamas-birth-certificate-part-ii/
If you add the information on these sites together I’d say the controversy is pretty well settled.
Tom
Politifact, FactCheck, and Snopes? Why not just provide some links to my.barackobama.com and Obama for America?