I think it's a little bit unfair to place a generalization that N900 should support portrait mode. I'm actually quite happy with the landscape format, it's what I initially paid for; a mobile-computer.

Here's my realistic wishlist:

Facebook Application
- I know theres Facebrick, but still would really prefer a more graphical friendly application with all the proper GUI and still retain it's conveniency. Take example of iPhone's facebook app.

Flash 10.1
- We seriously need this! One of the major reasons why I bought an N900 is because of the full-flash desktop web browser.

Better Performance
- I still believe the N900 still lags from time to time depending on how stressed it gets by certain multitasking even though thats totally understandable. However, when theres nothing running its really depressing to witness some grudgyness when scrolling up and down your contacts (or anything else really).

Tbh, most of the already-available N900 applications blew me away at first try, i'm not asking much but yeah... a smoother lag-free N900 is we need. Who wants a laggy phone anyway?