nVidia's own control panel is not always very intuitive to use. Especially the 3D rendering settings are very cryptic and difficult to navigate. Even the new control panel introduced with the 9x.xx line of Forceware drivers isn't a real improvements for these problems.
nHancer is a tool to improve the usage of these features. Both normal and advanced users should find nHancer to be a big step forward.
Additionally, nVidia drivers include a unique feature, that allows them to define profiles for every game, which control various image quality, compatibility and optimization aspects. But in the standard control panel, this feature is even more cryptic to use, so most people never bothered about it.
But it's such a powerfull and handy tool, even for the average guy. So another aspect of nHancer is to improve the handling of those profiles by adding many features that the normal control panel doesn't offer at all and improving the ones that it does offer.
Lately, this feature has received some new attention, since the new SLI technique requires nVidia to provide such a profile for a game to get any speed improvement. But these profiles are just as interesting even without SLI, just to enhance the gaming experience with any game.
New Features in Version 2.3.1: