According to the Minecraft forums, a list of Minecraft passwords and usernames has been released. While many will be safe and not on the list, many will. You can check to see whether you're on the list or not at a link at the bottom of this page. Whether you're on or not, I would change passwords anyway, just to be safe. I know I have. This has to be the second or third time Minecraft accounts have been comprimised.
In addition, apologies to those who are sick of Minecraft threads. I realise this will be the fourth thread on the forums front page as of posting this, I just hope you can understand the urgency of this. Also note that a quick search was done, apologies if another thread has been created with the same content, time is of the essence.
Find out if you're on the list here
http://dinnerbone.com/minecraft.php
Read more about it here
http://forums.mcbans.com/index.php/topic,186.0.html
EDIT: It is also advised that you only use client mods you trust, if any at all, it's suspected that this is how the details were taken.
In addition, apologies to those who are sick of Minecraft threads. I realise this will be the fourth thread on the forums front page as of posting this, I just hope you can understand the urgency of this. Also note that a quick search was done, apologies if another thread has been created with the same content, time is of the essence.
Find out if you're on the list here
http://dinnerbone.com/minecraft.php
Read more about it here
http://forums.mcbans.com/index.php/topic,186.0.html
EDIT: It is also advised that you only use client mods you trust, if any at all, it's suspected that this is how the details were taken.