While sitting at Panera bread checking email today I developed a need to change my mac address because Panera has a 30 minute connection limit between 12 and 1pm.  A quick google search by Jay revealed this:  http://www.nthelp.com/NT6/change_mac_w2k.htm.  It takes about 3 seconds to change it and presto, I was back online.  Obviously I don’t recommend doing this anywhere where it might matter, but a simple coffee shop probably isn’t going to sue you for getting 60 minutes vice 30 minutes to check your mail.