iTunes does not recognize my iPad when plugged in with usb on a mac

• Is this the first time that you ever connected the iPad to the Mac?
• Have you activated this iPad yet within iTunes?
• Did you try launching iTunes while the iPad is connected to the Mac?
• Have you been able to sync before and this is a new problem that has developed?

The connect to iTunes logo is self explanatory. Without some clue as to what you have already done, you make it difficult to give suggestions.

Yes, this has been reported by a lot of people using Windows Vista (including me) trying to plug in their iPad 2 for initial set up.

Is this the first time using it?

Or is it registered with another computer?

Try re-installing itunes to the computer.

This is the title of the OP's post ....

iTunes does not recognize my iPad when plugged in with usb on a mac

The OP is using a Mac.