CRITICAL UPDATE! The World Ends With You works now
The latest version of iDeaS, 1.0.2.4, released in May runs Squeenix's urban-themed opus "The World Ends With You" without significant graphical error (every emulator up to now has shown the matte layer (black) on top of the sprites and most backgrounds).
To get past the opening cinema (Neku running from the frog noise, not him waking up at the Scramble Crossing), you'll have to set your CPU overclock and frame skip to none. Then you'll have to hope it works (33% of the time).