Ensidia have claimed World First on the Death God. Given the non-linear progression into Ulduar, a lot of other guilds were able to pull off world firsts on other bosses. It also seems that Ensidia was focusing on clearing Ulduar in normal mode, as none of their kills were done on hard mode. This means we're unlikely to see Algalon downed this week (not by Ensidia, anyway).
While it came as no surprise that someone killed him, what surprised me was that it was Ensidia. I was betting on Vodka (can I get a 'for the Alliance!' from anyone?) and that they managed to do it while many of the EU realms were having stability issues. Of course, it should be noted that Ensidia was the same guild that cleared all Wrath content three days after its release (they hadn't decided on a name yet).
Boubouille over at MMO Champion has a full raid list and info on some of the loot that dropped, including a rather nice cloak and a piece of that legendary healer mace.