I was thinking about a buffing cleric last night (making D&D characters in my head is one trick I have to help me fall asleep, since normally I fret about work or something), and came to a strange point of analysis.
Chain SpellCA works on a spell that has a single target and a range greater than touch. As such, it's somewhat limited in how it works, especially for the really juicy buffs you'd like to chain. People fiddle around with arcane reach trickery, but I don't particularly like that, primarily because I'm of the school of thought that believes you can't chain rays.
But, Divine WardPHBII seems to fit the bill nicely, for a certain class of feats. Wouldn't work with magic vestment, but any touch-range buff that targets a person could be chained to the entire party by feeding it through Divine Ward. Better yet, running it through the Ward only costs a turn attempt. With DMM:Chain, that means 5 turns nets you a (say) chained Heal, Spell Resistance, Superior Resistance, etc. That's not too shabby.