They are not sold under the Newton brand

They don't run the Newton OS

They don't have a stylus

They aren't sold as PDAs

They don't have an *official* SDK (even though they should have)

They don't have any removable storage (SIM cards don't count, before you ask)

They don't have a removable battery

They don't have a serial port

They don't glow green in the dark

They don't weigh as much as a small brick

How much not like a Newton can you get? The HTC Touch has more in common with the Newton than the iPhone/iTouch...