Death Records Now

As my grandmother used to say,"they are few and far between," but a few do exist. On the FamilySearch.org pilot site they have a few. I know they have some Texas death certificates. http://pilot.familysearch.org/recordsearch/start.html#start

Also, the state of Missouri has a wonderful website that includes:
Missouri Birth and Death Database pre 1910
Missouri Death Certificates 1910-1958
http://www.sos.mo.gov/archives/resources/birthdeath/

Georgia’s Virtual Vault has a database of Death Certificates for 1919-1927. http://content.sos.state.ga.us/cdm4/gadeaths.php

So, if I were in need of a marriage or death certificate, I would always check any websites for the state that would have issued the certificate.