You could also solve the problem with a hardware database. For instance, I know my projector is delayed by 22ms because multiple reviews mentioned it, so that's the value I use in Project Diva. You can't find this info for most TV's.

Unfortunately, no one with the resources to really tackle this problem seems to care enough to do it.

I should also note that what many games do do is offer some type of user calibration, ie, press the notes with as good timing as you can manage, and we'll assume the average is the amount of delay in your setup. This kind of works sometimes, but it's imperfect for obvious reasons.