I don't know if you can use the installer several times. The bundled one installs apache, mysql, php etc. in addition to the eZ-files. My guess is its not possible...
What I've done several times is to get a copy of phpMyAdmin (web-interface to mySQL), create a new database manually, and then using the sql-queries provided in /kernel/setup/packages/.../. (you can run them in myphpadmin) Here you also will find the default designs etc. used by the installer.
Next, setup a new siteaccess, which is easiest done by copy a previous one and alter the site.ini. (database-name, design etc) Remember to register the new siteaccess in override/site.ini.php.
Ok, I know this is not what you asked for, but you learn a great lot of eZ doing it :-)
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