Downfall uses a loot system developed by (name here) of (server here) called FuriousRaid. FuriousRaid (FR) is a modified and automated extension of the suicide kings style of loot distribution. That is, points are earned for time spent in a raid at a predetermined rate. The person with the most points wins the item and all his points are subtracted to zero. He then starts earning points once again.
All point tracking is handled by the FuriousRaid addon. Read more on the specifics here: http://wowace.com/wiki/FuriousRaid
(more to come here)