Stimulus Watch has a listing of the "shovel-ready" projects the mayors of Illinois submitted in the 2008 U.S. Conference of Mayors report. Check it out. You can click on a project to read its description. You can also discuss the project and vote on whether you believe it is critical or not. For a more local view, you can drill down to projects in a particular city.
So far the total of cost of all the projects submitted by Illinois is $3,108,484,657