If rebooting it like said above doesn't work, is your iPod jailbroken, or did you go to some untrustworthy site? My iPod's Safari has frozen from those two things before and usually just unbricks itself for some reason after a couple days.
Hold down the home button and the power button at the same time. It should eventually reset itself.
That^ Just do that cuz that happened to my iPhone a couple of times.
I just power down, then comes back up. When you hit Safari, it should either go back to the frozen page, or reset itself where you enter your web address.
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