As if Google hadn't stunned the industry enough in the last few weeks -- what with its decision to raise $4 billion and its entry into instant messaging and Internet phone service -- the company has now started brokering ads in print publications, including PC Magazine and Maximum PC. The news has left even veteran Google-watchers scratching their heads, wondering what the Mountain View, Calif. company's up to this time. Google itself shed very little light on the situation, issuing to virtually every media outlet the same uninformative canned statement: "Google is testing a program to place ads …