The Rootsweb website has one of the
largest collections of free online genealogy databases.
It is
worth spending a bit of time browsing here,
you might be surprised what you find.
Rootsweb/Ancestry.com
Message Boards 
search the
world's largest online genealogy community with more than 17 million posts on over 161,000 message boards
Rootsweb Civil War Rosters

this database
contains more than 32,000 records with over 10,500 distinct surnames
Rootsweb World Connect Project

search over 660 million names in user uploaded Gedcom Files
Rootsweb Metasearch

simultaneously search over 40 Rootsweb databases,
including Rootsweb Surname List, Social Security Death Index, land records, newspaper indexes, passenger lists..
Rootsweb US Marriage Records Database

this
marriage records database contains
over 618,000 records with more than 97,000 distinct surnames
Rootsweb US Death Records Database

this
death records database contains
over 583,000 records with more than 72,000 distinct surnames