MABELLE  I've been using NoteTaker for quite a while now, and although it could use some improvement, I haven't found anything that does all that this app does. I teach, so I especially love the slideshow feature and the ability to post my notebooks to my website. It's clumsy on features (styles, fonts, multi-line), it needs tagging instead of (or in addition to) categories, but it's still very useful. I store documents so they're together with notes, thoughts, to-dos, mail (which i paste in). I've looked at Circus Ponies' Notebook. It's so much a clone of NoteTaker (which came first?) that I wonder why they don't marry their efforts. CP is marketing more aggressively and their website is better looking. Their product has a few features I like (more options in text features, different wallpapers) but not enough to make me switch away from Notetaker. Here's what's missing in both these programs: (1) better outlining - they should match some of the features of Omni Outliner (columns, notes) but leave off the complicated styling features, (2) calendar integration, (3) email integration. %80 of what comes across my desk is in email form. Why do I have to copy and paste emails between programs to keep mail, docs, notes, and calendar item in the same place. Yes, yes, I know: Entourage project. Hate it.   
(Version 2.2.3)