I remembered a great tutorial that I think can really help! It is available at the Alias|Wavefront website. You may have to sign up to become a member but it's free.
Dynamic Tutorials - Alias|Wavefront
Then under "Soft Bodies" click on "How to Animate a Melting Object". That should help a ton in making it melt nicely.
I've attach one that I made:
mahalo,
Myk
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