There has been a recent phenomenon of hacked accounts lately, more than ever. WoW had a recent problem with Xfire, and several people got their accounts hacked. The leader of Rebel Rising [rawr], one of the top PvP guilds in Guild Wars just got their account hacked and the hacker disbanded the entire [rawr] alliance and deleted the guild. This is a guild that had worked for years to establish itself in the GW PvP community, including its very own tournament cup named after them. But the fact that it can all go away so easily, as it did from one hacker, makes us aware of the inherent dangers and vulnerabilities we face in this environment.
So we'll say what's been said by the game developers time and time again: don't download questionable third-party add-ons. Don't give anyone your account name or password. In fact, the best thing to do is to create an email account specifically for that game account and create a password that you don't share with any other accounts anywhere. Taking a few extra minutes to do these things can save you the frustration you'd face when you realize that hundreds or thousands of hours of gameplay were completely lost due to carelessness.