There is a demo available :
http://www.store.cakewalk.com/b2cus/ProductInfo.aspx?productid=10-DSD21.00-20E Vol 2 has these 11 categories :
1) atmospheres (27 programs, on the demo it's the 1st and 2nd sound)
2) combinations (33 programs, of mixed type, voices, epiano+voice, clavi, etc..)
3) effects (28 programs, for movies, sci fi, space, machine, etc)
4) ele. pianos (30 programs of various tines, chimes, rhodes, wurlizer, suitcase.. demo 3rd song)
5) electro mechanical (14 programs of clavi and clavi+voices, wah clavi)
6) grand piano (19 programs of various pianos.. concert/honky/etc.. but you probably have a preferred piano module already)
7) organ (23 programs of various organs, some cool organs in the demos)
8) strings (22 strings programs of various attacks, for background, some with voices.. not for orchestra scoring)
9) synth basses (39 programs of various tecno/dance bass.. no real bass here)
10) synth leads (21 lead programs, mixed lead sounds, mostly cut through the mix sounds)
11) synthesizers (44 programs, some Arp, JD800, Juno, Jupiter, etc..)