The developer is too modest when he states that this is an extension of Classic NotePad. Jotz goes way, way beyond CNP. It saves its "notes" as independently-accessible RTFD files in package format, which means they're always there for export or re-use.
Indexing-and-search is phenomenal, with a browser-like search function that takes in an unlimited number of Jotz notefiles. (You can also instantly generate a list of principal words in the notefile.) RTF formatting allows color, highlighting, and the like, yet the user interface couldn't be simpler.
Notes can be meta-indexed with class labels. Sorting can be done under several different categories. Drag-and-drop makes import incredibly simple.
Having bought a license for it, I quickly made Jotz my principal organizing tool, and I haven't changed my mind yet -- even after trying Alepin, iOrganize, MacJournal, etc. All of them are worthy products, but lacking the perfect balance of features that is Jotz.
All this describes the old form of Jotz. The rewritten form (1.3) has few visible differences from the old version, but works (as advertised) much more efficiently and smoothly. The developer knows how to avoid messing with perfection.