Several articles are going along the web saying that Google home page has baffles the “California Online Privacy Protection Act.”, which states that:

Any commercial net operation that collects personal info about its users “shall conspicuously post its privacy policy on its Web site.” This means a link to the policy must be “located on the homepage or first significant page after entering the Web site.”

Thus an army of privacy-minded people have came out to reason to make Google add a link to their privacy policy on their home page.

Here are some articles related to this:
World realizes Google home page is ‘illegal’
Google Fights for the Right to Hide Its Privacy Policy
Is Google Violating a California Privacy Law?