From the page of the WSFS:
The purposes of the WSFS, according to its rules,
are as follows:
too
choose the recipients of the annual Hugo Awards (Science Fiction Achievement
Awards), to choose the locations and Committees for the annual World Science
Fiction Conventions (the Worldcons), to attend those Worldcons, and to
choose the locations and Committees for the occasional North American Science
Fiction Conventions (the NASFiCs). (A NASFiC is held in North America in
any year where the WorldCon is outside of North America.)
World Con Bids
a very good World Con bid site is maintained by Chaz Boston Baden that keeps track of all the WC bids
Site Selection for the 2007 Worldcon will be administered by Noreascon 4
Site Selection for the 2007 NASFiC, if necessary, will be administered by CascadiaCon (the Seattle NASFiC in 2005).
Under the current rules, Site Selection for the 2008 Worldcon will be administered by Interaction.
Under the current rules, Site Selection for the 2009 Worldcon will be administered by L.A.con IV.
Should the pending return to 2 years bidding amendment be ratified at Noreascon 4,
no sites will be selected at InterAction, and Site Selection for the 2008 Worldcon
will be administered by L.A.con IV.
In this case, members of Interaction who are not membres of L.A.con IV shall
be eligible to vote for the 2008 Worldcon.