In July 2012, Wizards of the Coast republished the three core 1st edition AD&D books.  When they were originally published in the late 70's, Gary Gygax was listed as the sole author.  Some of you may recall that this engendered a 
 
 
 
 “creative rights dispute” between Dave Arneson and Gygax.  The terms of a 1981 settlement specified that Arneson would receive “co-creator” credit for Dungeons & Dragons.  However, the 2012 versions of the books do not even hint at Arneson's contributions (
click this link). Are you OK with that? If so, take out your OSR membership card and tear it to pieces.
Havard's Blackmoor post on this topic
OD&D Forum thread where I attempt, in vain, to elicit support for the cause.  
Catacomb librarian makes mention of Arneson's absence.
Some more people who don't like how Arneson is being treated. 
WotC UNPERSON