Zero-G is pretty popular among game composers in general, and Nintendo also uses their libraries quite a bit, as SimonMKWii said. For example, two drum loops from Zero-G Datafile Two were used in Super Mario RPG: Legend of the Seven Stars and a drum loop from Zero-G Ethnic Flavours and a flute from Zero-G Ethnic was used in The Legend of Zelda: Ocarina of Time.
Well, I didn't really find anything... except for "XTC 418" which is in the folder Hook+Shout 09. It sounds a lot like a clip that's in the WL4 soundfont which I THINK goes unused. If it is used then I don't remember where.