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The first one I read was 'The Truth', which I think was a great starting point because the world is fully developed, but since The Truth has its own characters independent of any of the other mini-arcs in the series, you don't need to have read any previous books to 'get' it.
'Going Postal' would also be a good start for much the same reasons.
The earliest book I would recommend would be 'Equal Rites'.
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