This website has descriptions, locations and photos of the historal markers throughout Ohio.

http://www.ohiochannel.org/your_state/remarkable_ohio/index.cfm

These sites list archaic medical terms that could be listed on a death certificate:
http://www.jansdigs.com/Racine/medical.html
http://www.genealogy-quest.com/glossaries/diseases1.html
http://loricase.com/old-medical-terms.html

Mass Times
This site is intended to find the location of a Catholic Church and times for masses--however--it has contact information and links to the church's website (if it has one). Great for finding a baptismal or marriage certificate.
http://www.masstimes.org/dotNet/ChurchLookups.aspx
Also, there have been a lot of consolidations in the Catholic Church (with more to come). You may want to contact a local church to see where the records may be now.

USGS-United States Graphic Names Information System
http://geonames.usgs.gov/pls/gnispublic
A great place to search for names of a feature such as a cemetery and get the GPS coordinates. I use this a lot to find cemeteries in areas I'm not familar with.

Veterans National Gravesite Locator - 1997 to Current
http://gravelocator.cem.va.gov/j2ee/servlet/NGL_v1
Read the information at the bottom for a full explanation.

Days of the week and months of the year in just about any language
http://domesticat.net/misc/monthsdays.php
Find out what month and day your ancestor died from the foreign language inscription on their marker.

Common grave stone motifs
http://www.savinggraves.org/education/bookshelf/carvings.htm
Common symols used on older cemetery markers.

I thought I'd post some of the links that I have found helpful in the research of my family tree. These sites are all free! And free is good--right?

Ohio death certificates Dec, 1908 to Dec, 1953
http://www.familysearchlabs.org/ (the site is free but you have to register to use it)
There are also census images, birth, marriage and death information for other states.

Ohio death certificate index 1913-1944
http://ohsweb.ohiohistory.org/death/

Index to obituaries in the Akron Beacon Journal 1940 - 2007
http://www.ascpl.lib.oh.us/internetresources/sc/oBITS/obits.html

Barberton, Summit County, Ohio birth index 1938 - Current
http://www.barbertonhealth.org/fullsearch.asp

Barberton, Summit County, Ohio death index 1938 - Current
http://www.barbertonhealth.org/fulldsearch.asp

Akron, Barberton & Cuyahoga Falls, Summit County, Ohio City Directories 1859 - 1969
http://www.akronlibrary.org/internetresources/sc/CityDirectories/