I have taken the election results for various elections and created vote total maps using Google Maps to overlay the election results. I have had much of this data in my files for years, for more information about the data check out the FAQ on this subject here.
Statewide Election Maps
Click here to view election results maps for Illinois Statewide primary and general elections. Maps are available by Illinois county, Chicago ward or Cook County Township. Every statewide primary and general election since 2002 and some selected elections from 1990-2000 are available.
Chicago Municipal Election Maps
Click here to view election results maps for Chicago Municipal Elections. For citywide races maps are available by ward or by precinct, for aldermanic races maps are available by precinct. Right now I only have the 2011 Municipal Elections (February and April runoff) loaded but I hope to add additional past election results soon.
Other useful maps including Illinois media markets and census data such as race, education and income.