In response to my last entry, Taking Note, Rob Tillotson pointed out NoteBook from Circus Ponies. Apparently, they are descended from the same NeXTStep application. The two founders of Millennium Software Labs, who made Notebook for the NeXTStep operating system, went off their separate ways. Co-Founder Scott Love apparently got the rights to Notebook's source code (for NeXTStep) and that went into AquaMinds NoteTaker. But then other Millennium Software Labs Co-founder Jayson Adams came out with NoteBook, his (re?)implementation of the original Notebook for Mac OS X. Fascinating. Because they both look really similar, and offer similar functionality.
I had basically sold myself on NoteTaker to start organizing school notes, but now I think I'll give the Circus Ponies' NoteBook a chance before committing.