Ok, I can see how a little program like this would be kind of nice to store your personal thoughts in. Especially if you don't want to deal with a REAL word processor and have things that you have to KEEP SECRET.
However ... sticking a registration window in my face right off the bat, then forcing me to create a password (maybe I don't need one?), before I can enter the program to check it out, is annoying.

This kind of shareware would be much easier to swallow, and really test if it weren't an obvious effort to make a few extra bucks. That's not what shareware is about, is it? It's about making good software that people cannot resist using and they feel they OWE you for doing such a great job of programming and making their life better. This is not that kind of software. Maybe some day, but not this week.

One technical problem I had was that I could not see the dates in the date pop up.

Suggestions,
Loose the stupid RED, IN YOUR FACE, registration box. Put in a simple menu option to pay up if people LIKE the software. If they like it, they will pay you. Shareware works. I've been paying for it for years (18+) if its good. If you annoy them right away, they aren't going to pay jack.

Make the password protection optional. Not all of us have to hide our feelings or daily affirmations from our wives, family or fellow employees. Making everything optional will win you big shareware points!

#1 rule of good design. Keep it simple. Loose the foo-foo colors and use standard OSX backgrounds. A nice grey stripe background on your main journal window would look great. You already have a good working layout for buttons, etc. You could tone down the buttons. Keep them all the same size. Different sizes look cheap. Solid color backgrounds left the building back with OS 6-7. Think "tasteful" OSX user ... And make the application for others, not yourself (no offense).

Otherwise, I think this could be a cool little journal application. Keep working on it, and we'll check it out again when the next version comes out.