Look, don't get me wrong. I am a fan of the N900 and obviously as I have them both and using it over the E90. Not being bias, the N900 isn't in the same league as the E90. After your comments I wonder if you have owned, used or even seen an E90?
It rather defeats the purpose having a phone that is given a decent chip, potentially one of the best OS that enables a 600mhz chip perform tasks on par with it's rivaling 1ghz chipped phones. Then limit it with a smaller screen, dicky keyboard and tiny battery, which bring it down and hinder you using it as a full blown laptop replacement and just a supped up smart phone.
See the E90 had both small screen and larger screen, unless required you left closed and used the smaller screen, this reduced fumbling and saved power. The N900 only has a large screen and touch one which drains like crazy, what do they do, stick a smaller battery in it than the E90. It didn't even come bundle apps wise as a business orientated phone.
All I am saying, it is a great phone, awesome potential and has it's place. However, it is no comparison to the E90, if you have used one and seriously lived off it each day, you would understand what i am saying. It's these little things that put them apart and has always placed the E90 on another level.