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Knowing a MAC address isn't a security issue, hell just arp -a and you can get a list of every MAC your machine has talked to recently. If some one is sniffing though they could also send the WOL packet and turn on your computers at random...^^ What he said, there are some free WOL utilities. But to find out what packet type your NIC supports, it will usually say in the driver properties. For the utilities though, you'll need your MAC address.
a side-effect of using WOL is that it is sent out via Broadcast, so every machine gets it, and anyone with sniffers running will pick it up and have your MAC address. So there are some potential security issues involved (which is why the packets aren't routable where I work).