Langford Death Certificates
If you have ancestors who died in MISSOURI after 1909, you will want to check out this site, and often: http://www.sos.mo.gov/archives/resources/deathcertificates/http://www.sos.mo.gov/archives/resources/deathcertificates/
The Missouri State Archives is now scanning and posting online, ALL Missouri Death Certificates. Once at the site, scroll down to their search engine. I've found it best to simply enter a surname and hit search (or press "Enter") and their entire database for that surname will come up. From there you can view those certificates that have already been scanned, or order a photocopy if not yet scanned.
Hope this helps others as it did with my DeClue line