If you don't know it by now, Lightroom 2.2 has been released. This mainly pulls in new camera support but it also fixes several major bugs. One of them is the bad scaling bug that I have talked about many times before. Funnily enough, the release notes were clearly written by marketing types as the sentence mentioning that this was fixed doesn't address the bug at all and makes it sound like it was hardly a problem:
"Print Sharpening produced edge artifacts in certain conditions"
The bug had precisely nothing to do with print sharpening. I am sure it could be severely exacerbated by sharpening but it had little to do with it. It even manifested upon cropping in the Lightroom interface! Anyway, I am very happy that this was fixed anyway.