I've been scratching my head, googled endlessly, and still haven't found the answer to this OS 10.5 oddity. In Leopard I noticed a rather suspicious looking device appear in my sidebar under 'shared'. Where you usually would see somebody's iMac, or somone's Power Mac, there's something called Mac0016003xxxxx etc (like a MAC address). I can't browse it or connect to it. Info shows it as a 'PC Server' Am I just being paranoid? It's there, off and on (mostly on) every day. It's just disappeared now and it may be my imagination but my download and upload speed appears to be a little faster. There's probably a simple answer, but I can't think what it is. Any ideas ?