But it's the ones who go uncaught and unidentified (those who we didn't highlight in our Cyber Crime Hall Fame that are actually the best. Attempting to cover your tracks is Law-Breaking 101; being able to effectively do so, that's another story altogether.
When a major cyber crime remains unsolved, though, it probably also means that those of us outside the world of tech crime solving may never even know the crime occurred.
PC Magazine has a rundown on ten of the biggest still-unsolved cyber crimes. Link -Thanks, Geekazoid!