That happens with any screenshot you take in landscape, not just in Safari. And this bug has been there since the beginning, not just in 4.2. And no, I don't know of an app that can rotate them, though maybe some of the photo editing apps might do it. I've just never felt the need to go looking for an app, because all I have to do is rotate iPad, lock orientation, then rotate it back. Although, now that the lock orientation switch is a mute switch, that might take a bit more work to do now. hmmm....