I really want an interface designed with usability in mind. Things like:<p>* No common task should require more than 3-4 keypresses you can easily remember. Arrow keys count. Corollary: navigate the menus with the number keys; shortcuts, ...<p>* Incremental search to look up contacts with (like emacs C-s)<p>* Operate without looking. In particular, there should be a way to get to "home" from an arbitrary state, options have a "return to default" key, all important menus stay the same, anything common/important can also be done by keyboard.<p>* Typing speed. With slow input, calendar functions etc are nearly useless. Unfortunately, the fastest solution, qwertz keyboards, still sell at a premium. Perhaps there is a way to optionally emulate a chorded keyboard on standard 12-key hardware? It should have some form of visual feedback enabled by default, like Apple's keyboard overview.<p>* Reliable Sync. Even with 348 contacts, 1000s of appointments, international characters. The point is reliably correct - everything I have had so far has messed up eventually.<p>* Todo list and calendar 2 taps/clicks away, such as for a shopping list<p>Besides, I'd like some gimmicks:<p>* Adjust lighting / color hue / contrast on images, cut them down to an image section. Cut videos to save space and improve art.<p>* Easy file sync, regardless of file format<p>* Track location over time and tag photos. Even if there is no GPS hardware, cell towers broadcast their ID (or location), and modern phones have an acceleration sensor.<p>* A 3-touch way to keep track of my money / time.<p>* Office to go<p>* Flashlight mode. Display lighting is usually bright enough to find the key hole, stuff I have dropped,...<p>I admit you asked about computationally intense applications, but this is what bothers me most about my gadgets.