The Axon Logic Haptic might be the iPad alternative you’re looking for if you’d like to run any flavor of the Darwin OS, which includes OS X.
Unfortunately, the capacitive touchscreen is an immediate deal-breaker for me; decent specs and PC quality hardware doesn’t get a rise out of me either. Think of hacking a netbook in half with a battle axe, ripping out the keyboard, then replacing it with a rather shoddy touchscreen. It’s a pretty frankenstein like device, but those who appreciate function over form could still be turned away from the 1.6 GHz Atom N270 processor, or terrible three hour battery (I assume this thing would only last two and half hours of use at most). Maybe I’m being picky, especially when this tablet boasts 2GB of RAM, a 1.3 MP webcam for those video iChats (until FaceTime arrives), all flavors of Wi-Fi, 3 USB ports bundled with an ethernet jack (why!?), headphone and mic connections, and a card reader. It’s even fleshed out with a VGA port, but despite all these miraculous add-ons, I’m still not impressed. You could buy it for $750 to $800, but I’d suggest you actually buy a net-book for $300 at this point.