some install / database for multiple domains

Not sure if it’s correct, but it works: give each individual blog a separate folder (or subdomain) and it’s own complete set of WP files. The WP_config.php file will be the same (db, username, password, etc.) except where it says:

// You can have multiple installations in one database if you give each a unique prefix
$table_prefix  = 'wp_';   // Only numbers, letters, and underscores please!

Give each blog it’s own unique table_prefix (ex. wp_, wpa_, wpb_) or whatever. You’ll edit each folder’s config file individually. There probably is a better way of doing it but I’m a ducktape coder, I do my own sites b/c I’m poor and can’t chose between food or web. 🙂 I probably shouldn’t be let alone giving advice. Good luck and god speed.