We're not going to post about what people are doing (we never have and never will post exactly how the serious exploits are done), but there is a clear and intentional way people are getting a lot of loot out of the Dragon Soul raid using the Raid Finder.
This method they're using gets around the "one shot at loot per week" rule, and it's something that Blizzard clearly from the get-go didn't want to happen. Bashiok is absolutely right as well -- it's well known amongst WoW's experienced playerbase that such exploits are never to be done.
There are reports that some people who've exploited the system are getting the exploited gear stripped from them in the EU; however there is no official announcement yet as to what's happening.
Once that's announced, we'll let you know.