The Daughters of the American Revolution Collection contains tombstone inscriptions from Colorado cemeteries. This collection is described in the "Genealogy" section.
The names, locations, and addresses of cemeteries in the state and references to published and unpublished transcripts are found in Kay R. Merrill, Colorado Cemetery Directory (Denver: Colorado Council of Genealogical Societies, 1985; Family History Library book 978.8 V34cc; film 1597842 item 4). The cemeteries can be accessed online at http://www.interment.net/us/co/index.htm.
Transcripts from some small cemeteries in 33 counties have been published in Lela O. McQueary, Colorado Cemetery Inscriptions (Englewood, Colorado: Kay R. Merrill, 1985; Family History Library book 978.8 V3m; fiche 6087257).
Colorado Cemetery Records - Access Genealogy
Colorado Cemetery Records - I Dream of Genealogy
Colorado Cemetery Records - Interment.net
Colorado Cemetery Records - D'addezio.com
Colorado Cemetery Records - Rootsweb.org
Colorado Cemetery Records - coloradogravestones.org