I really would like to be a person who runs outside regularly, but beautiful weather combined with icy sidewalks make it hard, and make me mad. When I have to run or walk on sidewalks like this, I compose notes to my neighbors. I try to come up with polite, clever, nice-but-reprimanding ways to encourage them to shovel their sidewalks so that when the snow melts, it doesn’t refreeze into death ice. Because it’s the law, it’s polite, it is good for my safety, it makes you a nice person.
I’ve spent a lot of time considering it. I commuted on foot for all of the winter of 2009-2010 and didn’t really come up with anything. Might just be easier to call the city and report them.