This is a small module that extends views field grouping options for CCK field with multiple values.
This module adds two new parameters: one for setting when the grouping limit will be applied based on the number of values, and other for adding a suffix to the end of the listing when the limiting is applied.
An example use case for this is when you have multiple Authors for a node, using node reference to Authors profiles. Using this module you can say: If a node is authored by more than 2 people, show only the first person and add 'et al' suffix to the end of the list.