Genealogy Today features a searchable index of funeral cards (a.k.a. mourning or remembrance cards). Funeral cards provide clues like birth date, death date, maiden name, and name of funeral home.
Read about funeral cards online, and search the database of more than 23,100 names.
Here is another article about funeral cards by Elizabeth Kelley Kerstens.
If you google the words funeral card index, you will get over three million internet hits, many of them leading to more online funeral card indexes.