Note!: I've not played a Paladin for a while and so this isn't maintained. Antiarc has written his own Pally Power replacement that I would recommend using in place of PB: http://www.wowace.com/addons/blessed/
Paladin Buffer is meant to simplify the assigning and managing both greater and single blessings... and there's not really much to it besides that. Includes a small buff status frame to see what the lowest greater and single blessing is overall and per class, the ability to buff individual classes through it as well as a key binding to smart greater and single buffing people. Syncs with other Paladin Buffer users, and includes an option (enabled by default) to sync with Pally Power.
Slash command is /paladinbuffer and the short cut is /pb
For broker users, you can use the plugin by fraz0815, Broker Paladin Buffer