Except we killed sarth 5 days after the game released It was like a world top 20 kill, so it was impressive. We also killed 25 man malygos like 8 days after release.Sarth wasn't hard in the slightest and wasn't made to be.
The hardest in game is 25 man heroic Maly. That was a fun defeat!
However, the only remotely "hard" content is 3 drake sarth, 10 or 25 man. Problem is, we got them over a month ago :[ All thats really left to do is play arena, but right now warriors are tied for the lowest represented class in the SK-100 (meaning they are very crappy right now). Hopefully with 3.0.9, arcane mages/rogues will drop in reperesentation, allowing other classes to move ahead.
As for boomer, those 3.1 patch notes aren't actually patch notes. Its a compilation of probable changes announced by blizzard. Meaning, they are subject to change/wont be finalized for at least another month.
Oh, and you can go to a.wirebrain.de/wow for a good patch mirror.