genealog.lc-il: Books in the on-line Library of Congress catalog with the subject "Illinois--genealogy."
genealog.vital-il: Where to write for Illinois vital records, Illinois genealogical and historical societies, the state archives, and a newspaper genealogical column. Or check
Illinois Vital Records Information for more current info on where to write for vital records.
Other Illinois Genealogical and Historical Resources on the Net
Digital Past Over 90,000 images
(and growing daily) from around 40 cultural institutions in (mostly) northern
Illinois. Most of the participants are public libraries who are either making
their own local history collections available online or working with their
local historical society to mount theirs. There are diaries, photos, biographies,
maps, etc available freely to the public through the site.