"First of all Google claims that whatever you do with
the search results will only show for your user and
won't affect other people's search results. This is
probably true as Google will not want to encourage
spammers and SEO professionals to abuse the system.
However it is possible that on the long term all the
votes especially the negative ones will indeed influence
the formula to some extent.
There is however a way to generate traffic through this
system without hoping for long term benefits. On the
bottom of the search results page there is a link calledSee
all notes for this SearchWiki. This shows the
wisdom of the crowd. It's a page generated by the users
of search wiki.
You can include your page for certain keywords on this
page just by voting for your page on a google search or
adding it by clicking Add
a result also on the bottom of the search results
page. If enough people check out this user generated
page you will get traffic through this channel."