Yahoo! Search Marketing has a new contest featuring billionairre Sir Richard Branson (of Virgin fame). The contest is titled - Think Big - and features a prize including:

1. Placement at the top of Yahoo! Search results with Yahoo! Sponsored Search
2. Placement in Yahoo! Shopping results with Yahoo! Product Submit
3. Inclusion in Yahoo! Local with a Yahoo! Local Sponsored Search listing and/or a Yahoo! Local Enhanced Listing
4. Banners across Yahoo!

I believe this contest's winner will probably garner the most valuable link award from it's previous winner - Slashdot. Imagine thousands and thousands of visitors each hour, all via the Yahoo! network. In addition, in order to win, you've got to have a product and site that's fantastically compelling already, so you can expect high conversions.

Discussion of the contest is ongoing at SEW.