At first, I wanted a higher-resolution screen. 800x480 seems so small. I've since realized that we're pretty much at the highest resolution we're going to get without making the device unwieldy. If the face of the device was all screen with no bezel (and then where would the web camera go?), then perhaps we could get a bit higher numbers in the HxV department...
I've also realized that what I want the bigger screen for is not what Nokia is building the device to do; I want a hand-held laptop, and that's just a contradiction in terms for most people. I want to be able to run desktop applications on this device, and the 480V resolution is often frustratingly slender for desktop apps like word processors or spreadsheets. But I'm a slender minority here; I'm betting that Nokia's concentrating their limited man-hours on making a device that does hand-held, carry-around tasks well.
My best hope for my niche "handheld laptop" fetish is for some sort of video out.