Thank you, I'm really glad that CN has stroke such a nice chord with you. Hope that you'll enjoy using CN. About text file functionality - I see that you already posted is as a request, great!

Please specify what is the difference to the existing "Export to TXT" function.

No problem ;)

This is a very nice idea, but the problem here is that the code will have to detect this special tag and exclude the note from view when the user is browsing one of its tags, which will be MUCH slower than simple filtering by a boolean column introduced into the Notes DB table.

This is done so for a reason: people have many times pressed ESC accidentally and lost all changes they'd made. Please see here: http://roadmap.cintanotes.com/feedback/3173-search/

Assigning colors to tags won't work, because a note can only be of one color and can have many tags. I'm thinking about introducing note categories, which will determine "what" a note really is and what can you do with it. Each category will have a set of flags assigned to it. Flags will be displayed directly in the note title as icons with checkmarks or dropdown lists. For example, for notes of "Task" category, the "Urgency(Normal/High/Low)" flag and "Completion Status(New/Started/On Hold/Completed/Cancelled)" flags can be defined. (Most probably flags will be implemented as special tags).

Do you mean automatically turn everything copied into clipboard into notes?