londrum - 5:41 pm on Apr 14, 2010 (gmt 0)
i reckon they pick up links from more places than the usual webpages. google probably note any URLs that pass through gmail. if people are emailing each other about a page, i find it hard to believe that google wouldn't count that as a vote.
so maybe you could try and do some 'email to a friend' or 'email your wishlist to a friend' kind of things.