There are not many out there any more. The Illinois program is compltely out of funds and only applies to certain areas in Illinois, so I have not heard anyone getting any downpayment assistance. There are some neighborhood stability programs offered for certain areas in Cook County. Check out their websites.
As far as downpayment assistance, if your credit score is 620-640 or over, you can get a gift for downpayment from a relative. Also, the seller can give you a consession of all closing costs if you put that in your contract, but rememember, it will reflect in their bottom line, so don't low ball and then ask for closing costs.