I haven't tried connecting my Quicktake 150 to my TiBook (I don't have a serial adapter), but it worked fine with OS 9.1 on my Power Tower Pro 200.
Actually, I don't even know if I still have the Quicktake (back in Hong Kong) because my brother-in-law sold my Power for me and I'm not sure if he included the Quicktake in the deal. I hope not, because it's kind of a museum piece now, even if I can't really use it for photos.
Anyway, if it's a Quicktake 100, it might even be more valuable down the line than the 150, because it was really the very first consumer digital camera available. Congrats on the purchase.