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Geohashing (Python recipe) by Raymond Hettinger
ActiveState Code (http://code.activestate.com/recipes/576732/)

Complete implementation of the Munroe geohashing algorithm.

Python, 16 lines
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import hashlib

def geohash(latitude, longitude, datedow):
    '''Compute geohash() using the Munroe algorithm.

    >>> geohash(37.421542, -122.085589, b'2005-05-26-10458.68')
    37.857713 -122.544543

    '''
    h = hashlib.md5(datedow).hexdigest()
    p, q = [('%f' % float.fromhex('0.' + x)) for x in (h[:16], h[16:32])]    
    print('%d%s %d%s' % (latitude, p[1:], longitude, q[1:]))

if __name__ == '__main__':
    import doctest
    doctest.testmod()

See detailed explanation at http://xkcd.com/426/ .