I have worked around this by adding the postgres user by hand:
sudo dscl . -create /users/postgres
sudo mkdir -p /usr/local/pgsql/data
sudo chown postgres /usr/local/pgsql/data
sudo dscl . -passwd /users/postgres <pw>
su postgres chmod 755 /Library/PostgreSQL/9.0/bin/initdb
su postgres /Library/PostgreSQL/9.0/bin/initdb -D /usr/local/pgsql/data
(There is a predefined user in OS X Lion: "_postgres" but that's not the one
the installer is expecting... )
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