Writing this on my iPod Touch, thanks to the WordPress app on the iTunes:).
In the past I have used the mblog app on my Nokia N80. What I remember about the mblog experience is the clunky keypad, the blog posts having to be uploaded to a Nokia mblog platform- not your own weblog. This is different.
The ease of internet use on the iPhone/iPod Touch is already changing the way people use mobile phone. The App Store and the Apps take the mobile experience even further. The other ‘smart phones’ that I have used are simply limited to talk + sms + email. This is virtually a full-fledged computer on your hands. Another confirmation, if you need one, that the iPhone is truly a game changer.