"Under Illinois law, fundraisers and charitable organizations are required to register each year with the Attorney General's office. Potential donors may then access important information such as income, expenditures, programs and administration before giving to the charity." Lots of useful information here on legal requirements in Illinois as well as FAQs.
Illinois ResourceNet: A Funding Access Initiative (IRN) is a university-based resource providing Illinois nonprofits and local governments with the competitive assets to access federal funding. IRN offers organizations a unique approach to grant access centered on providing information and resources on an interactive website, working with experienced technical assistants on designing high caliber proposals, and connecting with a diverse group of partners to meet proposed project goals.
Located in Quincy, Illinois, the CENS provides services to nonprofit organizations to enable them to operate more effectively. They offer a wide variety of workshops, maintaining an up-to-date calendar of events with registration information on their web site.
The Donors Forum enables the philanthropic and nonprofit sector to address community concerns with comprehensive information, skilled leadership and the resources necessary to build institutions and affect change.
A useful website with many links to sources of federal and state funding information for Illinois.
A list of Foundation Center Cooperating Collections that operate in Illinois.