I've had a few good saves. Two stand out in my mind.
First one, the party was Warlock, Warrior, Rogue, Retnoob Paladin, and Me (healadin). We were in stratholme going towards the scarlet guys and pulled two groups of the skeletons by accident and the eye of kel'thuzad spotted us as well. The warrior and rogue went down fast. The Retnoob died at 80% mana (he wasn't healing). So it was down to me and the warlock. We were playing aggro ping pong, I'd get everyone on me with a holy wrath and consecrate, toss off a heal and then bubbled. The Warlock who was finishing off his rain of fire then got aggro. He sacrificed his voidwalker and began to cast hellfire. Lock gets down to half health and I toss a blessing of protection on him pulling aggro back to me. I start healing through with holy light crits (lucky string of 4 in a row), but eventually the rain of fire pulls 3 of the elites off and they made short work of the warlock, but he's able to kill one of them. I'm left standing at 30% mana and about half life when the 2 elites, each at 40% life come back to me. Consecrate, Judge Light, pop up SoW and start healing with the occasional swing. Finish one off, Start focusing on the other but by this time I'm at 10% life and 3% mana. Throw up blessing of kings for more health, judge light and toss on wisdom. Burn through all my remaining mana on exorcism and a divine shield. Shield drops I go to 3% life and pop LoH and finsih off the last elite and rez the party. Afterwards I get the permanent nickname of "The Immortal Pally"
Second one is on Murmur. Me, Warrior, Hunter, Rogue, Tree Druid. Druid gets hit by the sonic boom and less than one second later gets tossed in the air by the debuff and promptly dies. Rogue follows suit when murmur is at 30%. Everyone is saying we should reset but I convince the warrior to get back in the fight and the hunter to focus on DPSing. Hunters pet drops at 28% and the warrior says to me over vent that we should run and reset but I tell him no, that I can heal the fight. The druid kept watching from his corpse saying a paladin could never heal it by himself that we needed to reset and rez him, that he should know because his guild is in Gruul's yadda yadda yadda. 3 minutes later and murmur is dead, I've blown all but lay on hands, and 1 mana pot. I say in party chat "I can't heal it, eh?" I was awarded for my efforts with the Greatsword of Horrid Dreams AND the Silvermoon Creest Shield. I recieved an invite to the Druid's guild and to the Rogue's guild but the warrior and hunter are in my guild and we had a great laugh at it :) And I'm now the Warrior's prefered healer over anyone else :P