Let's compare the things built into my iPod Touch 4, versus what came on my HP Touchpad ..
iPod -> Touchpad:
Facetime -> Phone/Video Calls - terrible Skype implementation, works great with a Bluetooth phone, not easy to pair a Bluetooth phone unless you have a Palm phone .. and then it only supports audio. And uses your cell phone airtime.
Camera -> Camera - iPod camera is lower quality, but it has 2 of them, and the pictures still seem to come out better (so far, I have yet to actually be able to take a decent picture with the Touchpad camera .. probably because I have to hold it facing away from me to take a picture of something other than me)
Stocks -> Nothing
Maps -> Maps (iPod uses Google, HP uses Bing. Bing Maps locates me in Mexico when I search for things in Detroit. Not funny.)
Weather -> Nothing (AccuWeather is a free download, and a very nice program, but I've reported about a dozen bugs with it, and the AccuWeather people have been very responsive to them, however, there have been no updates yet)
Contacts -> Contacts (Touchpad wins here hands down for Synergy connection auto-downloading every contact you could ever want practically.. however, it's a ton easier to integrate iOS's contact list into an app, from what I've seen.)
App Store -> App Catalog .. well, i guess not too much difference there. App Store does have an interesting "Genius" option though, and of course has 10x + more apps.
Settings -> Settings - iOS has a universal Settings menu for everything - apples to oranges here, but a lot of apps in webOS have a Prefs option in their App Menu, which a lot of people never even notice that there is an App Menu.
Game Center -> Nothing
Clock -> Clock Settings? - Touchpad's alarm clock is abyssmally quiet. Doesn't even wake up my dog.
Calculator -> Calculator - default HP calculator seems to be nearly impossible to hit buttons on sometimes
Voice memos -> Nothing?
Calendar, Notes -> Calendar, Notes - Touchpad easily beats the snot out of the iPod notes program. Haven't used calendar on either to compare.
YouTube -> Web browser - the Youtube app on iPod formats youtube into a nicely consumable interface for the iPod display. The Youtube website is not very well configured for tablet display at all. webOS can access anything on Youtube, Youtube app can only access a tiny subset of Youtube.
iTunes -> Nothing - HP Play is available free, but absolutely sucks compared to iTunes
Music -> Music - the iPod player is hands down the winner here. HP's music app sucks.
Videos / Photos -> Photo and Video app - the HP photo app is absolutely amazing. The Video app, I've never really been able to try because the Touchpad doesn't play any video formats that I actually have videos in. iPod plays all of them.
Mail -> Mail - the Mail app on the Touchpad is really not easy to compare -- the iPod has much better Gmail support, the Touchpad email client could really use a better design to truly make it easier and more useful to operate. They are both really kind of clunky.
Nothing -> Messaging - the Messaging app on Touchpad is all sorts of awesome. I already mentioned, though, that it's Skype connector sucks really hardcore.
Nothing -> Exhibition - well, exhibition sounds like it's really dumb, but it's actually quite nice.
Push Notifications -> Synergy connectors - well, iPod wins here.
... draw your own conclusions.
I think -if- you've used an iOS device before, unless you really commit yourself to trying to get the most out of the Touchpad, you're going to be sadly disappointed by attempting to comapre them (and I've never used the iPad to compare it's apps). If you've never used an iOS device, you might well fall in love with the Touchpad - my gf has. The only Apple device she uses is an old iPod non-Touch.
After having used a Touchpad for about 3 weeks now (wow has it been that long?? maybe only 2 weeks now.. wed after the fire sale started), i'm starting to hate iOS when i go back to it, realizing that it's not nearly as smooth as it felt like it used to be - however, every animation on the iPod plays perfectly smoothly. Sometimes it takes it's sweet time getting there, but it will get you there smoothly when it does. The Touchpad will usually get you there faster (not always) but it doesn't -appear- as smooth.