I used to use Jotter way back in the day, which was nothing more than a simple notepad type addon which you could write stuff down so you wouldn't forget later.
There used to be several of these simple addons way back in the day, but I can't find one that is still being maintained..and something like NotesUneed is way to feature filled (i.e. bloated) for what I'm looking for.
Need something like AceNotes to come out of the woodwork, for an idea of what I'm talking about there are at least 4 mods that are all very similar. Jotter, Jotter K, DAQ_Notepad, and In-game Notepad, but they all seem to have been abandoned.
I've been using Jotter for MONTHS now and I can definitely say TinyPad OWNS Jotter.
Notepad, however, somehow jacks your keyboard no matter what, as long as the window is open. Even if you don't have the cursor active (ie you hit escape), you can't move your character around with your keyboard or anything until you close the Notepad window completely. With Jotter you can, and with TinyPad you can as well. Not sure why that is with Notepad, but /shrug, I'll definitely be using TinyPad from now on!! :)
I've thought it might be interesting to take the concept a step further and make a sort of post-it-note addon where different notes could optionally be made to pop up automatically as reminders, based on triggers specified by the user (like entering a town or other zone, talking to a vendor, time/date, checking your mailbox, checking the AH, picking up an item, etc.). NotesUNeed *kind* of does this, but presents the info in a tooltip, can't be used as a simple notepad, and is limited to notes for NPCs, players, items and a few other things (i.e. not zones and general types of NPCs, etc.).
I knew someone would bring up Omnibus. I remember arguing six months ago that it had been abandoned; now it's been a year since it was last touched. It's worth mentioning though.
Yes, about a year ago I was working on Omnibus. I may update it in the future (the GUI code available these days is MUCH better than what was available one year ago). Despite the fact that I haven't touched it in all that time, Omnibus still works and functions without major issues. I even use it to this day.