A dual-input touchscreen, and some kind of analog stick.

Haven't had any problems holding it, but maybe a tad bigger screen if the system weren't any bigger. I love how it fits perfectly in my pocket as it is right now, perfect portable.

Oh, yeah, & more durability. :/

the speakers in the lite are a bit rubbish compared to the ones that were in the old phat model, the dpad was better too, if they put the old dpad and speakers into the lite Id buy it (again).

If it were just ever so slightly bigger, it might keep the big joints in my thumbs from feeling arthritic after I play.

Double touch screen... and maybe a small analog stick...

It seems alot of you want bigger buttons, do you all have big hands? I've never had any problem and my hands are big-ish.

There is always room for improvement! Bigger, higher resolution screens. Faster processors for more advanced graphics, sounds, and game play. Built in motion control and rumble. Faster wireless connection. Longer battery life. Sure it's great now, but imagine if it had any, or heck, what if it had all of those features!

 No proper motion controls or rumble, if you're playing in a cramped enviroment, like a train, then you cant really play properly, or in a train anything like tilting would not work because of all the bumping. With rumble I would fear that I might drop it and break it, even if it is unlikely