Yeah you're right, The dell XT with capacitive touch was released in december of 2007 with a capacitive screen, the iPhone was released on june of 2007, I thought the op meant the iPad.
Well I did have a capacitive touch screen "tablet PC" (Panasonic Toughbook). But that's pretty much irrelevant since the UI didn't have pinches and swipes and wasn't designed primarily for use with fingers.