(I thought I would submit this, as CHOW currently has no recipe for this.)
Set a coffee filter basket, lined with a filter, in a strainer, over a bowl. Pour the cream almost to the top of the filter. Refrigerate for 2 hours. The whey will sink to the bottom passing through the filter leaving a ring of clotted cream. Scrape this down with a rubber spatula and repeat every couple of hours until the mass reaches the consistency of soft cream cheese.