It's good having The Wizard for a friend. I updated a client's DNS settings at GoDaddy two days ago and was preparing to give them a first look at their Community Server site. I could hit the site on my laptop, on my wife's PC, but not on a machine in my office that I really needed to view the site with. So it had to be a lock on the site's old IP address on the machine. No matter what I cleared in FF and IE I kept pulling up the old site.
Time to call The Wizard, who gave me the goods, as he always does. To flush the local DNS settings at the command prompt type
ipconfig /flushdns