The sky is falling - the sky is falling! LOL
Cookie based behavioral search - there's a fun one! Very few of us leave cookies for very long anymore.
IP based search - not much more than country searches on google. And that's a great thing for those of us who target a certain country! More traffic coming my way! Woohoo!
And what's really priceless are all these people not connected to google who somehow know how the inner-workings of google's never released algorithms are going to work in the near future...
Google has always changed things up from time to time. Someone has to rank on the first page no matter what they do and content - real original content that is, will remain king.