This was the first time I'd heard about it, and a really good explanation.
http://techreport.com/review/21516/inside-the-second-a-new-look-at-game-benchmarking
> Also, I hate to break this news to you, but most of your findings will only be
> applicable to you in the end. There are a lot of factors that affect input lag, but
> the one thing you cannot actually control are video driver issues. I know of at least
> one issue with nVidia drivers, or instance, that will trigger insane amounts of input
> lag on a completely inconsistent basis and may even cause multimonitor MAME to refuse
> to take input at all if VSync is turned on with some versions of nVidia's drivers.
>
> These uncontrollable factors make it impossible to actually come up with a single
> relevant lag test for every combination of OS, video card, and setting.
Well, that just means he has to have a large number of OS's and video cards and video drivers at his disposal for benchmarking 
To be fair I think his solution thus far for objective measurement is pretty creative...
- Stiletto
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