Well, that was something to wake up to...
Twitter has indeed been hacked, with 250,000 accounts exposed, mine amongst them.
This week, we detected unusual access patterns that led to us identifying unauthorized access attempts to Twitter user data. We discovered one live attack and were able to shut it down in process moments later. However, our investigation has thus far indicated that the attackers may have had access to limited user information - usernames, email addresses, session tokens and encrypted/salted versions of passwords - for approximately 250,000 users.
I'm now behind a nice, secure password randomly generated by 1Password.