That looks like a directory script, maybe you could use that script and have it intergrated into wordpress.
Its definitely WordPress: http://www.jawatankosong.biz/wp-login.php Wow I find this site amazing, I would love to know how this is done as well.
Looking at the source code, looks like a script from http://www.dynamicdrive.com/ that is implemented with wordpress.
Yep - It looks like a directory script I suggest the use of wordpress and a magazine theme + the use of a script like PHP classifieds ( http://www.deltascripts.com/phpclassifieds - http://demo.deltascripts.com/classifieds/ )