From this article: http://news.cnet.com/8301-13579_3-57469635-37/city-of-san-fr...
"According to stats from the Journal, this won't be much of a blow to Apple. Only about 500 to 700, or 1 percent to 2 percent total, of San Francisco computers are Macs."
So yeah, you'll have to pardon me if this strikes me as non-news.