Forgot

Q: How do I change an e-mail address from an older account in order to access my older blog and get my password retrieved?
A: I understand completely what you are saying here. Yours is not a new problem. All bloggers have to realize that they are responsible for their own blogs. To manage your blog you have to maintain an active email account and record down your password somewhere safe. That's all.

Changing the email in Blogger is actually changing ownership of a blog. There is only one  correct way to do it: http://www.google.com/support/blogger/bin/answer.py?answer=41448

It is usually too late, if your old email has become inactive and you have forgotten your password. Just cut your losses and start a new blog. It is free.

source: http://www.google.com/support/forum/p/blogger/thread?tid=62c5fb94da237945&hl=en&fid=62c5fb94da2379450004a3e94bcf6c2d