The Supreme Court denied cert. in this case, so the decision of the Seventh Circuit stands, and the aspect of the Illinois wiretapping law that criminalizes the recording of police officers in public is unenforceable in Illinois.
ORIGINAL POST (5/8/2012):
In an opinion issued today, the Seventh Circuit Court of Appeals ruled unconstitutional, on First Amendment grounds, the Illinois law that makes it a felony to make audio recordings of police officers in public. Richard Posner (the man, not the kidney) dissented.
Previous coverage here, here, and here.