I love the I Dismember Mama/Blood Spattered Bride double feature trailer, its hilarious!
Some others I love: The Undertaker and His Pals, Cannibal Ferox, The Strange Vice of Mrs Wardh, The Case of The Scorpions Tail, Phantom of The Paradise (foreign version) They Call Her One Eye, I Spit On Your Grave, Corruption, Ginger, Wicked Wicked, Switchblade Sisters, Coffy, The Big Doll House, Dirty Mary, Crazy Larry, Cool Breeze, Putney Swope (freakin crazy!), White Lightning. I could go on and on! :)
You can get alot of great Grindhouse trailers on the 42nd Street Forever DVD. If you havent got that yet, pick it up!