Here are the databases I use most often when volunteer researching about ancestors in the State of Arizona.  This list is mainly for my own quick use, although you may find it helpful if you are seeking information about an Arizona resident.

Searchable Databases

Mesa Arizona Regional Family History Center
http://mesarfhc.org/
– AZ Obituary Index (Free)

Arizona Genealogy Birth and Death Certificates
http://genealogy.az.gov/
– Search births 1887-1930; deaths 1878-1955 (Free)

Maricopa County Recorders Office
http://recorder.maricopa.gov/recdocdata/GetRecDataSelect.asp?mcrs=1
– Search all recorded documents in Maricopa County since January 1983 (Free)

Maricopa County Assessor’s Office
http://www.maricopa.gov/Assessor/ParcelApplication/Default.aspx
– Search for a current homeowner in Maricopa County (Free)

Supreme Court of Arizona – Public Court Records
http://www.supreme.state.az.us/publicaccess/notification/search.asp
– Search all Arizona public court information online (Free)

Maricopa County Library District – Death and Obituary Database
http://mcldaz.org/logon.aspx?src=search%2fmisc%2fesources.aspx%3fctx%3d1.1033.0.0.1%26Target%3d1228%26ESourceLogon%3d1&ctx=1.1033.0.0.1
– Search the America’s Newsbank Death and Obituary Database (Free with Maricopa County Library Card)

Phoenix Public Library Arizona Newsbank Database
http://www.phoenixpubliclibrary.org/wcLogin.jsp?resid=3370
– Search the Arizona Republic, plus dozens of additional random newspapers, fully archived online since 2001 (Free with Phoenix Public Library Card) 

Department of Veteran’s Affairs Gravesite Locator
http://gravelocator.cem.va.gov/j2ee/servlet/NGL_v1
– Search for grave locations of Veterans buried in any National Memorial Cemetery (Free)

Additional Informative Links

Obituary Lookup Volunteers of Arizona
http://freepages.genealogy.rootsweb.com/~obitl/volaz.html
– Request help in looking up an obituary (Free)

Arizona History and Archives Division – Family History
http://www.lib.az.us/archives/famhistory.cfm
– Contains resources and links to Arizona family information (Free)

Arizona State Library, Archives and Public Records – Genealogy Collection
http://www.lib.az.us/is/genealogy/
– Contains a list of all newspapers held at the State Archives, and allows you to make an obituary request if you cannot visit the Archives in person (Free)

Maricopa County Area Cemeteries
http://www.rootsweb.com/~azcemete/phoenix_and_maricopa_co.htm
– Contains a list of all area cemeteries with some lnks (Free)

USGenWeb Tombstone Transcription Project of Arizona
http://www.rootsweb.com/~cemetery/arizona/arizona.html
– Search volunteer entries of Tombstone transcriptions (Free)

Looking for an Arizona Obituary?
http://freepages.genealogy.rootsweb.com/~azclips/
– Search about 8,000 Arizona obituaries (Free)

Ancestry.com
http://www.ancestry.com
– The best search site on the web!  (Search SSDI and some public records for free. The rest is subscription based.)

Good luck in your searches!