The good old EWQLSO...some great recordings in there. Still very useful and great sounding.
LASS, when it came out. Never seen before playability.
Omnisphere, Uhe Diva
Evolution Series - World Percussion. Great set of samples, very useful mic posistions and very well programmed.
VI-labs Ravenscroft, Modern U, top notch piano libraries
EW Hollywood Strings. Great sound...the loading time sucks though (on my system, anyway)...
Cornucopia Strings. Great lush, dark sound, surprisingly useful....
Sonicuture: Grand Marimba, The Cantebury Suitcase
NoiseGuild: 24ToneGongs