May 24th, 2008 will be the first Saturday after the algorithm was published. The coordinates are:
0.1266480113970560, 0.5475331240942810
It will be a Saturday, so there will be an xkcd meetup at 4:00 PM in regions where they are reachable.
Coordinates
2008-05-21 in the Boston, MA graticule -- Coordinates are in Hopedale. The exact coordinates are in someone's house, so obviously they will not be reached within a foot, but they can expect some odd passers-by on their road.
- North-East of the Netherlands: 53.1266480113970560, 6.5475331240942810
- Graz, Austria Near Strallegg, eastern part of styria: 47.400246°, 15.722771°
- Austin, Texas, United States 30.1266480113970560,-97.5475331240942810 - Looks private, but perhaps accessible.
2008-05-24 in Baltimore, MD -- Coordinates are at a house on 229th st in Pasadena MD.
- Saskatoon, Sk - south at College and Highway 5, down ridge road 3045, just south of second farm on East side, middle of that field. Watch out for John Deeres as farmer maybe seeding!!