PlaySpan, the market system used by several different MMOs (including World of Tanks and Guild Wars 2), has been hacked. Whilst Guild Wars 2 and others have since confirmed that they remain secure, if you're a World of Tanks player, now might be a good time to change that password.
A statement sent to The Verve said: "PlaySpan has detected and terminated illegal access to PlaySpan Marketplace user information. Importantly, there is no evidence any payment account - credit, debit, or prepaid card - data was accessed or exported from the PlaySpan network. However, user IDs, email addresses and encrypted passwords of Marketplace users were compromised."
"We sincerely apologize for any frustration or inconvenience this incident has caused our customers. We know PlaySpan's business depends on consumer trust. Security is a top priority for us, and we are redoubling our efforts to strengthen PlaySpan's overall system security."