Marvel Clamps Down On Game Skins

mrleemrlee writes "Marvel Entertainment has sent a cease-and-desist letter to The Skindex, which houses skins for customizing computer games such as The Sims and Freedom Force. The Webmaster has responded by pulling the website's content and publishing a copy of the letter. This is interesting in that such skinning has been going on for a decade, at least since Doom. Only now has Marvel decided to protect its IP; what might it have in store? Do other sites have anything to worry about?" Are user-created game skins of their characters good publicity for companies like Marvel, or an unacceptable copyright violation?