Yes sure: 4 min boot up, 2h battery life. Inadequate GUI probably completed by a custom HP touch GUI skin that falls off the bridge every time you run a soft not thought of by HP (not their fault but inevitable when 3rd party solutions try to complement a whole OS). And you're forgetting about the Atom CPU heating up, coughing up its guts whenever you launch anything more than applets because of the Windows legacy. All that to run softs that have better touch-optimised iPad equivalent.
That was cool when the alternatives were WinCE PDA's, back in 2004. think of the Sony U mini XP touchscreen PC or the OQO.
But that was a 2004 concept, still available right now in many touchscreen PC (Archos 9?EeePC T?) if you want it.
I'd rather use a fast, power efficient 3G iPad with a real touch-screen GUI for serious computing on-the-go. i.e: the remote sysadmin tools I need+general computing apps, instant use, not thinking about finding a power source every 20 mins...