Let's talk about them.
I own a Nexus one and personally I am still unable to play games because there is only an A and B key, and the dpad is all the way up by the top now.
Personally since i own an ipod touch, I wouldn't mind being able to have the buttons lay almost upon the game itself, and taking more of a model from some of the ipod emulators.
Just me though
In case you are wondering what i mean... take a look at these (i'll update screenshots as I go along)
If you can see it, the controller layout is preserved and isn't just a uniform controller layout. And the landscape puts the buttons on top of the game. (my only complaint is that there isn't an option to scrunch it up so the buttons aren't on top during landscape)
N64 one is a toughy but this is what i got (It's hard because some devs have used an accelerometer others crammed it onto it like that. The other one is basically a SNES controller with accelerometer controls for the yellow arrows i think.
and the NES emulator looks almost identical to what we have now.
Being this, yongzh is doing a great job, but there is a need for updated controls. At the moment, I think people need to wait and stop bugging for a ps1 emu that they KNOW their phone will lag up with, and let the touch screen controls be worked on and tweaked. At the moment i have refunded everything, since it is just too hard to play any of it at the current thing, especially with the button locations and limited phone space i have.