Let me refine this: if you used a password on a site that is the same as the one you used for your Showdown account (forum or server), I recommend that you change it. Showdown is hacked and is still down
I mean, he could leak our ev spreads, but I'm still just waiting to see what else this guy has. Hacking showdown seems like it was done more out of spite than out of greed, since there's very little gain there.