This came from Yahoo today:

Hello Andrew,

Thank you for the comprehensive information. We realize how important
the email account is and we do apologize for any inconvenience this has
caused you.

We have prompted our system to generate a new password for your Yahoo!
account. This password will be sent to your alternate (Hotmail) email
address and will help you restore access to your account.

Once you have logged in, please update your Zip Code and verify your
alternate email address so that you may use our automated password
request form if you experience future sign-in problems.

To do this, please click on the "Account Information" link on your My
Yahoo! home page, or "Mail", "Options" then "Account Information"
within Yahoo! Mail. Next, click the "Edit" button on the Member Information
section of your Yahoo! ID Card.

On the following screen, you will view your Member Information screen
that includes your current alternate (non-Yahoo!) email address. If
this address is not currently listed as "Verified," please click on the
"Non-verified" link beneath your email address.

Next, click on the "Send Verification" link to initiate the
verification process. A verification code will be sent via email to your alternate
email address. You may click on the link provided in that email, or
return to your Yahoo! ID Card to enter the code. Once the process has
been completed, the word "Verified" will appear beneath your email
address.

Currently, our system will only send new passwords to verified email
addresses. We apologize for any inconvenience this process has caused.
Please contact us again if you require additional assistance with your
account.

Please Note: if you would like to change your password, please make
sure that your new password is difficult for other people to guess. A good
password will contain a combination of uppercase and lowercase letters,
numbers, and/or special characters such as %, $, and +.

Thank you again for contacting Yahoo! Customer Care.

Regards,

Carlo