Two Chicago research links-free searches

I have been searching and finding very helpful info on two Internet resource pages. I wanted to write about them case it might help others in their searches. There is the IL state archives page. It is still a work in progress, not complete. So keep checking back. The link I provided is to the database page featuring the links to close to 60 databases through the state archives website, including many court and military info. Here are a few specific databases I found helpful searching for my Polish relatives:
1) Illinois Statewide Marriage Index, 1763–1900
2) Illinois Statewide Death Index, Pre–1916
3) Illinois Statewide Death Index (1916–1950)
You can search any of these databases by just surname. You can search by the whole state or just Cook County for Chicago. You can do a global search with just the surname and it will tell you what databases that surname is in. If you have a more common surname, you can enter a first name too. I did searches 6 months ago on this site and did not see any Sanetras. Now I have found several Sanetras in these databases. I found that it was easier for the Slavic names to just search by surname, because you don't know if the first name on the record went by Micheal or Mikel, etc. It's also good to see who else has the surname. And it's already hard enough to guess how the surname was spelled, so to have to guess at the spelling of a first name and a last name can be daunting!
http://www.cyberdriveillinois.com/departments/archives/databases.html

The other helpful site I found is the Cook County clerk page regarding naturalization/citizenship.
http://www.cookcountyclerkofcourt.org/NR/about.aspx
You can do free searches and see the index listing. Then if you wish, you can purchase the records on-line. Records are down loadable immediately in a zipped file. (vital records) I never knew Adam Sanetra became a citizen until I saw this database last month. He left and went back to Poland within a few years of becoming a citizen. I did have to send in a request by mail for that record though. I highly recommend reading the info on this site. One piece of info I found helpful on this page was that pre-Sept 1922, women didn't usually file for citizenship. Unless widowed or unmarried (spinster). The man, who was head of household filed, and then his wife and children became citizens through his citizenship. To see more about that and other helpful citizenship & naturalization info, check out the Cook County link. I should be getting Adam Sanetra's citizenship records any day now and am really looking forward to that! I hope you may find something helpful about one of your ancestors on on either of these links.