The table listing host cities has a seriously misleading column head called "Olympiad." An "Olympiad" is the four year period starting with the year a Summer Olympics is held, the first being the period 1896-1899, the current, the 29th Olympiad, started 2008 and continues to 2011. Yet the column omits the "III" for the 1906 games, the so-called intercalated games as they were the second held within the Olympiad. And the Winter Games, most egregiously, are numbered sequentially by those cities which held it, but these are not Olympiads! They are simply the numbers of each Winter games.
The numbering convention for Olympics are: Summer Games are numbered by Olympiad (hence there are three Games which were not held for three Olympiads); Winter Games are numbered by sequence of games actually held (war-years games canceled are therefore not numbered). The column head, as it now exists, conflates these two distinct numbering conventions as misuses the term "Olympiad
http://en.wikipedia.org/wiki/Talk:List_of_Olympic_Games_host_cities#Misuse_of_term_.22Olympiad.22