Soak soak soak. Fill with enough hot water to cover the burned areas by 1", then bring to a boil. Let stand until it cools, then scrub with a nylon scrub pad. You should be able to remove the crusted-on burnt parts, though the enamel may be stained underneath.
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http://reviews.ebay.com/How-to-CLEAN-BURNT-POTS-and-PANS?ugid=10000000009185959
I'd just give it 20 mins for enamelware tho.