Apple claims that the galaxy tab 10.1 is a blatent copy of of the ipad based on what I've read.
The problem is that any flat, eyboardless 'computer' adorned with a power on button is basically a tablet pc. Some manufacturers have slightly different dimensions but so what? These devices will continue to evolve.
All I see is the rapid evolution of the tablet pc. Apple didnt invent the tablet pc and the notion of such a device existed in Star Trek since forever.
Switch on the devices and the differences become obvious in a very short time. Currently I have an Android tablet and its flexibility runs rings around the iPad. Apple, i suspect simply doesnt like that.