They aren't down (anymore), but in case you are still unable to read it:
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Evernote's Operations & Security team has discovered and blocked suspicious activity on the Evernote network that appears to have been a coordinated attempt to access secure areas of the Evernote Service.
As a precaution to protect your data, we have decided to implement a password reset. Please read below for details and instructions.
In our security investigation, we have found no evidence that any of the content you store in Evernote was accessed, changed or lost. We also have no evidence that any payment information for Evernote Premium or Evernote Business customers was accessed.
The investigation has shown, however, that the individual(s) responsible were able to gain access to Evernote user information, which includes usernames, email addresses associated with Evernote accounts and encrypted passwords. Even though this information was accessed, the passwords stored by Evernote are protected by one-way encryption. (In technical terms, they are hashed and salted.)
While our password encryption measures are robust, we are taking additional steps to ensure that your personal data remains secure. This means that, in an abundance of caution, we are requiring all users to reset their Evernote account passwords. Please create a new password by signing into your account on evernote.com.
After signing in, you will be prompted to enter your new password. Once you have reset your password on evernote.com, you will need to enter this new password in other Evernote apps that you use. We are also releasing updates to several of our apps to make the password change process easier, so please check for updates over the next several hours.
As recent events with other large services have demonstrated, this type of activity is becoming more common. We take our responsibility to keep your data safe very seriously, and we're constantly enhancing the security of our service infrastructure to protect Evernote and your content.
There are also several important steps that you can take to ensure that your data on any site, including Evernote, is secure:
Avoid using simple passwords based on dictionary words
Never use the same password on multiple sites or services
Never click on 'reset password' requests in emails — instead go directly to the service
Thank you for taking the time to read this. We apologize for the annoyance of having to change your password, but, ultimately, we believe this simple step will result in a more secure Evernote experience. If you have any questions, please do not hesitate to contact Evernote Support.
The Evernote team