To much advertising! Yeah; they have maybe three at the top which have been paid searches - but when they finish their search engine it'll be a non-paid search like Google which searches the internet! At the moment its practically Yahoo Search
gMail! You do realise it will check your e-mails and send you advertisements if it thinks you're after something? It will also check your e-mails for keywords in order to advance its own search and advertising direction.