postfix & dovecot- IMAP/Maildir format not working

[Paul Cartwright <debian@pcartwright.com>]

I am trying to change my mail  output on Debian Lenny to IMAP, using my
Maildir folder.. I've changed /etc/postfix/main.cf
and /etc/dovecot/dovecot.conf

and here is what my postconf -d output shows:

home_mailbox = 
mail_name = Postfix
mail_owner = postfix
mail_release_date = 20080902
mail_spool_directory = /var/mail
mail_version = 2.5.5

dovecot -n shows this:
mail_location: maildir:~/Maildir

/etc/postfix/main.cf has this:
 
home_mailbox = Maildir/

/etc/dovecot/dovecot.conf has this:
dovecot.conf:mail_location = maildir:~/Maildir

I'm still getting mail in /var/mail
what am I missing?

-- 
Paul Cartwright
Registered Linux user # 367800