Have you bought a S60v2 phone today when S60v3 is out there?
Neways, although i do not know of any specefic site which lists the great ones right now, you can look for apps and games on these sites. you will find Freewares as well as commercial trials.
www.allaboutsymbian.com
*my-symbian.com/main/index.php
*www.handango.com
BTW, here is a list of freewares i compiled for S60v3 phones. Not all, but most of them will work for your phone also.