Just got the Book of Nine Sowrds last night for the hobby shop. While I haven't been able to look it over completely, I have given it a good skim, and found some stuff that was a bit odd:
* Adaptive Style feat - It doesn't list if the abilities you choose with it start out usbale/active or not. If the can be used immediately, the feat is awesome for swordsages. A full round to recover a bunch of abilities instead of just one, and a mid-battle rebuild of them also.
* Master of the Nine Forms PrC - Something's up with this guy. While the skill ranks and the sample character suggest that you can qualify for the class as a Swordsage 7, I can't get how the feats works out for that. The sample character even has too many feat for his level. Am I missing something?
Overall, I think the book's pretty good. It gives a "mystical school" feel to a standard martial character, and the classes seem to range the gamut from the more eastern influenced weapon master (Swordsage) to a warrior who simply has some magic abilities (Warblade) While I see a backlash against yet another magically oriented class, I think these new ones are done pretty well, and cover new ground. The problem with doing up a new non-magical fighting class is that the fighter has the territory covered pretty well. It's very flexible, and only gets more so with every fighter feat added to the system. These new classes go out into new areas of expertise, and I am very happy with what I've seen so far. Nothing is as bizarre and underpowered as Truenaming or Shadowcasting from Tome of Magic, but I've only looked at the swordsage carefully (I may be playing one in the near future) so I may change my mind after I look over the book again tonight.
Raymond