Helpful Website
Besides the Illlinois Archive website I've told so many about(http://www.sos.state.il.us/departments/archives/databases.htm), I would like to say here that another I have found to be most helpful is:
http://www.rootsweb.com/~usgenweb/ussearch.htmhttp://www.rootsweb.com/~usgenweb/ussearch.htm
At this address is probably the only place on the web that doesn't show up anywhere else that I know of.
Personally I have found some of my ancestors there, too, when they couldnt be found anywhere else--and I think I know how to search Google.com for answers!
Hopefully you will find it helpful too. Neva