Tech News - Google's new world and your privacy: Why you should worry | Techgig:
This can be useful. But also troublesome. Suppose User X watched a little too much of belly dancing video clips on YouTube. When he and his kids are using his account and are on Picassa, browsing family photos, an advertisement for a service tagged to his YouTube habits may appear. Embarrassing? Would you like more privacy? Google thinks the service will be incredibly empowering.