Well, here's a common listing for those of you that might be interested. Although i still think the best way to hardeing a firewall is to block all outbound connection and just open the required ports, but my boss does not think like that...
AIMSTER - PORT 5025
AUDIOGALAXY - PORT 9000
BEARSHARE, XOLOX, LIMEWIRE & MOST GNUTELLA CLIENTS - PORTS 6345, 6346, 6347, 6348, 6349
WINMX/OLD NAPSTER - PORT 6699
NEW NAPSTER - PORTS 8875, 8876, 8888
KAZAA/MORPHEUS - PORT 1214
EDONKEY2000 - PORTS 4661, 4662, 4665
GNOTELLA - PORTS 23, 80, 6667, 8080