I couldn't find a cart system in DotNet 2 that keeps track of UOM (Units of Measure).
I have a client that ships the same item individually, in small cartons (of varying size 4-12 in a carton) and by the case.

Currently, we put in each as a separate item and include the UOM in the item description (works, but it would be nice to see "Units" in the cart.



Another client ships product by SquareFoot, By Piece (tile), and By the box. The box is easy, but the customer has the option of selecting by the squarefoot or by the tile (rounded to the nearest sq ft).



Another thing is that uploading product data to the site from a typical accounting/POS system, they usually have UOM (just to make it a bit easier).