It looks like Google's shopping around for space in Boston or nearby Cambridge, according to WebProNews, which spotted some want ads for account reps for its ad sales team.
In addition, rumors among Boston-area real estate agents has Google reportedly looking for 100,000 to 200,000 square feet of space, which would replace the smaller office for sales and engineering groups it currently keeps in Cambridge, according to a Boston Herald story, "Google on search of a Hub: Tech co. fetching multiple results in bid for office space." The Herald story cautions that Google conducted a similar search about a year ago, which ended with no action being taken. A Google spokesperson, of course, declined to comment on rumor or speculation.
The Boston or Cambridge space would give Google a presence close to several universities -- and so tech talent, including Harvard and MIT.