Paladin Weapons

What weapon should I specialize in as a Paladin if i'm going Holy?

One-handed Maces (and shields) are the weapons you'll be using as a holy Paladin. All healing weapons are either maces or staves (although this will change with Wrath of the Lich King, because of the way they're consolidating spell damage and bonus healing), and paladins can't use staves.