Ah, thank you. Actually, the first thing I did was Google search for a site that would test my port 80 and they said it was clear . . . though I suppose that doesn't mean that there isn't some other thing taking over port 80. But SP1 definitely changed something; I rolled back SP1, reinstalled, and WAMP hummed along like it always had.
I'll check for firewall updates and IIS when I get home to
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