According to a Chicago Tribune article,
If all goes as planned, newly digitized versions of county records such as birth and death certificates and marriage licenses will be available beginning in January on one searchable Web site that will revolutionize how such research is done, [Cook County Clerk David] Orr said…
The Web site is part of a massive yearlong effort to digitize the county’s 24 million vital records, which date to 1871, when record-keeping began after the Chicago Fire wiped out previous stockpiles, clerk’s office spokeswoman Kelley Quinn said.
The records have been scanned and indexed are are currently being loaded into a server and the website should be available in January. Once a record is found, there will be a fee to download and print non-certified copies of the records.