(Sorry for the repost but /. didn't give me the option of logging in as I posted so it posted anonymously, which was not my intention. It also didn't give me the option of correcting that mistake, and made it near impossible to find the comment after I had logged in, but why would I want to do those things anyway? :))
I've tried the others. Siri just works and has an integrated interface and implementation that invites regular use rather than discourages it. That is what's revolutionary. Haven't you noticed that that's what Apple does? They take geeky technology that sometimes isn't so new and make it useful and usable to normals.
Once you start down the road of "Android can do that- you just have to sign up to Vlingo, open this app...." you've already lost- normals won't get that far.
I've two Android phones which, heaven knows, I bet can do most if not more than my iPhone does for me, but there comes a point where I just can't be bothered to feel like I'm fighting with my device to achieve anything. That's why I use my iPhone.
Sadly that means the killer app for my android devices now is that they take a large SIM card, which means I can buy a SIM abroad for 3G data, then use the Android device as a wireless hotspot for my iPhone.
You will likely dismiss this comment as Apple fanboy-dom. It isn't. I've programmed and used mobile devices in the mobile industry since 1996. I'm over any loyalties I've ever had, save for the one to the users to make any easy to use device to cater for their needs.
It's ironic that most Android fans who post knocking Apple and their technology are in flat denial that Android is made by engineers FOR engineers- and boy does it show. So where is the reality distortion field now?
(update : and now I'm reporting it its stripping the line endings- even though they're there in the edit box. Weird, broken, implementation, /.)