>Given that water expands when it freezes, and that the majority of an iceberg is below the surface, wouldn't it therefore follow that the melting of the iceberg would result in its constituent water taking up less volume? Therefore, wouldn't the sea levels actually fall?

But Terry, once the iceberg is free floating around it is more likely to go north (in the antartica) or south (in the Artic), where warmer temperatures will melt it, producing the rise of the sea level. I even think that friction would make it melt, but is just my wild guess.