Thanks to gregdean for the following.
In the new PC fantasy RPG game Diablo III, there is a LOST reference in the second desert zone of Act II. The player comes across a shipwreck in the middle of a desert, and an item called "The Black Rock Ledger: Page 23." Here's the text of that item:
"Madness, complete bloody madness. The captain has disappeared into the desert somewhere, and the rest of the survivors are convinced there's some sort of monster after us. I'm starting to think the crewmen that died in the wreck got the easy way out, lucky bastards."
Black Rock, 23, mysterious monster... Blizzard, the company behind Diablo and Warcraft, loves LOST !
http://www.diablowiki.com/The_Black_Rock_Ledger,_page_23