Make sure to update your flash and adobe acrobat reader. Right now most keyloggers are taking advantage of people who have the older versions with the exploits to get their keylogger to you. Some hacked sites will start a pdf download that is infected, others display infected flash ads or site elements. So I would go to adobe.com and update flash and reader asap.
Also Minion will never have you enter your wow account login info. Heck it doesnt even run when WoW is running.
Like others said its java and you can look at the source code your self.
Make sure your virus/malware scanner is up to date and do a full scan. If it finds anything post all the information here so we can help you figure out where it came from.
Update: The latest scam going around is this:
http://www.wow.com/2010/03/31/new-sc...gets-launcher/