If your lucky.. and can snag a cool domain name that's already indexed in the engines.. that expires.. ya see.. that traffic can be bought for the price of a registration..
cause the engine's don't delete these domain names if they are indexed..
so buy good traffic for $8.95 (reg fee) and redirect this traffic to a 'balanced' content type site you already have on the web.
And if you point several dozens of such domains: huge gains. DomainGator.com gained 1,000,000 Alexa positions in 3 days of using this method (from 1,500,000 moved to 500,000) ! I am currently conducting more tests as I have a generous supply of such domains