Accurate Rip. An interesting idea works with either Exact Audio Copy (my favoriate freeware ripper) or with dBPowerAmp.
It collects a database of folks who have ripped and compares your rip to make sure that it is in fact good. Make sense since every CD should be identical.
Of course, one could ask why we couldn't just pay for and download CD quality music, but that's for another post.
