As the subject suggests, if you play a Paladin grab the addon Pallypower.

It's a lightweight blessing management addon that allows you to assign who gives out what blessings. You can then buff (left click for greater, right for baby blessings) just by clicking the addon. The addon displays the remaining duration, symbol count and who has improved blessings. Don't be a "I-just-buff-chad" this addon makes life so much easier for you and other Paladins.

Google Pallypower 3.3.5a and enjoy!!