schemas and backups

Is there an easy way in 7.3 for a user to back up all of the structure and
data in his/her schema?

If I just do one table it works fine, and if I want to back up the entire
database as superuser, it works great.

Also, I've always been a little confused about pg_dump: how are you supposed
to supply passwords to it in a non-interactive way (such as through a weekly
backup script)?

Thanks to the developers, I really like the new schema/privilege system. It
makes multi-user environments much easier and simpler.

Regards,
    Jeff