Galileo - Heretic or not?

A recent article (link) suggests that further attempts are being made at trying to rehabilitate Galileo. Almost all papists today would agree that Galileo was right and the Vatican was wrong. Most, however, would argue that the Vatican doesn't claim any infallibility in areas of science. Here's the problem, Galileo was tried not for science errors, but for heresy. So, was Galileo's teaching heretical or not? Was the Vatican right then or now (assuming that they are now willing to acknowledge that Galileo's views are/were not heretical)?

-TurretinFan

Update: News article entitled, "Pope Praises Galileo" (link).