The rules for entering the contest are simple, in order to qualify for the contest a page must have either a link back to the V7N home page, one of the Official ‘V7ndotcom Elursrebmem’ v7n SEO Contest banners, or the following text “We support v7n.com“. To win the first prize (4000$ + one iPod), you must place first in Google (organic rankings) for the search term on May 15, 2006, noon, Pacific standard time.
For more information, visit Contest Keywords Announcement Forum.
So it seems that Yahoo has a more up-to-date index than Google, probably because Google wants to check new pages for spam.