Links to web sites I have found very useful for my research.

Illinois State Archives (Illinois Secretary of States Office)
Free statewide marriage (1763 - 1900 not completed and of course Cook county-Chicago starts in 1871 after Chicago fire) and death index (1871 - 1950 depending on county). Very handy if you have ancestors from Illinois.

Minnesota Historical Society
Free statewide death index (1907 - 1996).

Iron Range Research Center
Free index to naturalization records.

Family History Center (Church of Jesus Christ Later Day Saints)
Lots of difference kinds of info and catalogue of microfilm that can be ordered at local FHC.

Ancestry
Paid service with Federal Census indexes and more.

The Statue of Liberty - Ellis Island Foundation, Inc.
Free passenger ship manifests port of New York 1892 to 1924.

BYU Idaho Family History Center
Free marraige and death index for western states (Arizona, Idaho, Nevada, Utah, Wyoming, and parts of Colorado, Oregon, Washington, and California). Some of my ancestors migrated to Idaho.

Lavey Parish County Derry Ireland
Church in County Derry, Northern Ireland with baptismal, marriage and cemetery records. I have ancestors originally from this parish in Ireland.

Illinois State Genealogical Society
Information and links to genealogy research in Illinois.