Hello everyone, I am a newguy here. looking forward to getting my N900 in my hand!
first of all, forgive my poor english

1. Almost exclusively landscape orientation. Lack of portrait mode
actually, I would like N900 fix on landscape mode. because it's a internet tablet(or small computer) "plus phone function". When you use your laptop, will you turn your computer vertically? When you use cell phone, speak to your friend, you won't look at the screen, right? besides, when I lie down on my bed and use ipod touch to survey the internet, ipod always screw the screen when I accidentally tilt it. that's makes me hard to read it. So, personally, I would like the N900 fix on landscape. and I don't have to screw my device when switch between one application to another

2. Password entry while browsing
it's the same when you use your computer. so it won't be my problem.

3. Small icons with big “Close” fields in ‘Desktop setup” mode.
agree

4. Not enough desktop panels, or space on them.
agree, more would be better.

5. Maps and Navigation.
no comment

6. Which brings us the problem of general lack of apps for the device.
Agree, I also hope we can have all the cool apps I played with on Symbian, Android, Windows Mobile and iPhone, running on Maemo. Tomorrow, please!