The Red Sox acquired Kevin Frandsen from the Giants for a player to be named later or cash, according to Andrew Baggarly of the San Jose Mercury News (via Twitter). The 27-year-old infielder has a .240/.304/.341 line in 453 major league plate appearances, all of which have come in a Giants uniform. Frandsen, who has an option remaining, hit .295/.352/.438 in Triple A last year.
He played second and short for the Giants in 2009 and has major league experience at third and at both corner outfield positions. He has played all four infield positions in the minors, so he's clearly versatile. Other than that it's hard to draw conclusions about his defense because of his limited time in the majors.
Earlier in the week, when it became apparent that Frandsen was available, Dave Cameron of U.S.S. Mariner thought he would be a great fit for the Mariners. The acquisition of Frandsen presumably means Boston's search for backup infield help is now less urgent.