NextGEN Gallery Thumbnail gallery is a grid of images that when clicked on, open in a pop-up full view. Some features you can add to your thumbnail gallery are as follows:

- set custom cropped thumbnail
- set custom thumbnail size
- pagination (set number of thumbnail images per gallery page)
- set custom lightbox effect

See example of gallery below:

[nggallery id=1]

As of v2.0 you are now able to add galleries through the Attach to Post Interface (ATP), on any page or post. Not only do you now have that new convenience, but you also have the option to add custom settings on a per gallery basis.