Illinois Birders Exchanging Thoughts (IBET):

This is an electronic mailing list where Illinois birders exchange bird sightings.
Subcription & Posting Info.

ILbirds - IBET - Official group page with at least the last one year of IBET posts. (subscription required to view).

Recent IBET Posts - The most recent 50 IBET messages posted on one page on Jack Siler's Birdingonthe.net.

Illinois IBET Messages - At least the past six months worth of IBET posts in a threaded format at Surfbirds.com.

Illinois Birders' Forum:
A comprehensive forum for discussion of all things relating to birds including rba's, sightings, discussion, conservation, identification, and much more.

National Bird Hotline Cooperative (BIRDCNTR):
This is a national email list that distributes midwest rare bird alerts to subscribers. Recent reports of all hotlines are listed on Jack Siler's site.  You may have to search to find the DuPage and Chicago reports.
Subcription Info.

The Birds of FermiLab:
Peter Kasper, is a physicist at the DuPage County lab and has been keeping careful track of his sightings for many years.  Along with his journal of recent sightings, he also has a terrific checklist, a map of the facility, and a site guide narrative.

Kane County Audubon Sightings:

Kane County Audubon maintains a page with recent sightings in the Kane County area that have been posted to IBET, phoned in, or e-mailed to the club. They also have a list of birding spots and a checklist of Kane County birds.

Carlyle Lake Bird Report:
Dan Kassebaum posts photos and recent sightings from Carlyle Lake in south-central Illinois.  Along with recent sightings he also maintains a checklist for the site.