To have a program to "type" a username/password for me. How?

To have a program to "type" a password for me. How?
Hello widespread wisdom...

I want to propagate public keys to several dozens of puters so I can login
passwordless.

I am not looking forward to typing (or cut'n pasting) a password a gazillion
times. They all have the same username/password combination.

I know that expect can be used to "type" a password (or to fool passwd to
change a password without manual intervention), but I don't know how.

What I want is ti fire a loop to copy my keys to all the machines and to
have the program to "type" the username and the password to free me up from
the dull stuff.

This *HAS* to be possible, does anybody know how?
Thanks! :)
ET

PS: No, I haven't researched this, this question is the beginning of my
research...
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