2008-05-24 41 -87
300 17000e Rd N, Momence, IL 60954; address conveniently converted from the GPS coordinates by the very useful website http://stevemorse.org/jcal/latlon.php; this can be read by my GPS enabled phone's software, as opposed to the actual coordinates. This turned out to be a farm ~60 miles south of Chicago, almost on the IL-IN border.
Link to coordinate calculator: http://irc.peeron.com/xkcd/map/map.html?date=2008-05-24&lat=41&long=-88&zoom=8&abs=1
Only one, sadly. (I'm pretty sure I got the place right!) But some lovely pictures were taken, and a lovely time was had by one.
It might be useful, for next time, for Chicago-area adventure-seekers to agree on a graticule to visit, as apparently some people did show up in Schaumburg, IL.
The site itself.