What the new 80GB PS3 differ from the 40GB PS3?

Question

I want to know what is the difference between the 40GB PS3 and the new 80GB PS3?

Answer 1

80GB - extended memory, but reduced backwards compatibility with PS2 games, it has only Graphics Synthesizer (PS2's GPU). Around 80% of PS2 games can be played. Available only in NTSC regions.
40GB - can't play PS2 games at all (all PS2 chips were removed), has 2 USBs instead of 4, no memory card reader, has wi-fi. Avalable in black and white colors. White is on sale only in Japan. Uses 65nm technology (lower power consumption). Improved cooling system. It's the latest version.