I have tried several times today (July 30, 2012) to connect to www.qgis.org (to get the online documentation). The site seems to be down.
Do you know if there is a mirror to obtain the Lisboa (1.8) full PDF doc?
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You can read the latest documentation online at http://qgis.readthedocs.org/en/latest/.
The manual for 1.8 isn't ready yet as far as I know because the documentation team is busy improving the overall working environment for authors and translators.