We just came across the City of Chicago's Property Tax Relief program. It provides a small amount of relief to homeowners whose property taxes increased in 2008.
Qualifying homeowners (based on property taxes and income level) will receive a cash rebate from the City of up to $200.00. However, funds are limited and it is first-come-first-served, so act quickly to take advantage of this program.
The City's web site has more information and an application form.