In the netgear there is a menu item (on the left menu) called "Attached Devices" which lists the attached IP's, Device Names, and MAC Addresses. (I guess ARP was a little too scary sounding... ;-) )
Anyway, right after I turn off my machine, and the machine is still listed in the ARP table, Wake-On-Lan works, i.e., the box turns on when sent the magic packet. When the ARP entry is flushed in 10 - 15 minutes and I send the WOL packet, the box does not turn on. It was suggested by someone who has a linksys that I pick a port and forward all UDP traffic on that port to Broadcast. However, the netgear refuses to allow me to enter the broadcast IP in the "Port Forwarding" menu. I've also upgraded to the latest firmware with no luck.