By the way, The Illinois law is likely to change in the near future...
IL House Bill 3325 was passed in both The House of Representatives and The Senate of the IL General Assembly and will likely be signed into law by Pat Quinn, Governor.
IL HB 3325 will allow 35% on the front windows if your rears aren't darker than 35%, 50% in front if your rears are between 35% and 30%, and no tint at all in front if your rears are darker than 30%.
I created a Facebook page to educate and alert people concerning this bill: Facebook - IL HB 3325
