Anything with a 400Mhz or faster CPU can run PocketUAE at about A500 speeds... but audio is choppy. As Marvel start to bring out faster XScale's the emulation should improve. I would also recommend a VGA (640*480) screen if you plan to use workbench (though it's not necessary)... 320*240 is fine for Games as most were Lowres on the A500 anyway.
Looks like Dev has stopped.