I've been required to oversee a bulk update of a few thousand users into a manually managed portal group for which the FIM Portal is authoritative. Anyone who has had to add more than a few users knows this can be a cumbersome process by hand via the UI. To save time from doing this manually through the Portal interface I've thrown together a PowerShell script that will read a CSV file of users and operations (add or remove) and process those requests against a group.