The Maemo/Meego series is getting closer and closer to being a general purpose computer. There are lots of sci-fi inventions that have been in the tech news lately: medical microscopes for cell phones that can diagnose disease, high tech particle or chemical sensors (you could ask what was in the air that made you start sneezing, is your water clean? How much sugar is in your blood sample?)

But realistically, what would you like to see?

My list:
* 1080 HDMI output
* Working USB (even if it's a community-supported hack.)
* Compass
* A little thinner and faster. (Current web browsing is not as fast as on a laptop)
* Don't remove/ruin any current features.

That's it! Until phones can diagnose medical issues or test air/water quality there isn't much left, IMHO, to catch up to desktop level computing.