Israel is a small country, divided between nine graticules from (29,34) to (33,35). In order to unite the few Israeli xkcd fans, a different algorithm was taken. Instead of the regular graticule, a rectangle of 67,000 square kilometers that bounds the entire state of Israel is used so that all Israelis share the same meeting point. In addition, instead of the Dow Jones the algorithm uses the USD to NIS exchange rate, to align with Israel's time zone and week days.
Since Google Maps does not show any map details inside Israel, it is recommended to also work with Walla Maps or Mapa, when both maps are on the 'hybrid' setting, until the geohash point can be positively identified. This step can be finalized by using the website Amud Anan, which has topographical maps of Israel.
A better option might be just looking up the exact coordinates on a map, but where's the fun in that?
Upcoming Geohashes
June 7th 2008 - Appears to be, while not inaccessible, pretty much out of the question for anyone who is not a seasoned hiker. A cross-check of the above-mentioned sites resulted in identifying this Saturday's point in a small wadi off the nameless summit 569, near Mitzpe HaMeshar in the Arabah (Paran area). If anyone actually makes it there, take pictures.