Mail only working with Ethernet, no wireless

I have 2 pop3 accounts in mac mail. All of the sudden they stopped working if i'm connected via wireless (any wireless, tried several in different locations, new ones too).
But if i hook up an ethernet cable, it will work. What gives? I'm on a MBP Pro, running 10.6.1

I also just noticed that Software update and Safari is not working either. Yet I can surf (and posting this) using Firefox. Problems with my network settings?

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