Retribution is a spec that has a lot to gain from intelligent use of macros. We have so many abilities that share cooldowns that there's no reason not to consolidate them. As hybrids, we have an enormous spread of abilities that we may not use often, but when we do need to use them, we need to use them at a moment's notice. And properly.
This article will cover basic retribution macros -- mouseover macros, focus macros, modifier macros, and that sort of thing. Macros hold an incredible amount of potential for customization, so it would be next to impossible to list everything a paladin might potentially use. Once you know the basics of how these macros are built, you can do whatever you please with them. Onward!