I thought I'd write a quick review of my TouchPad. I haven't been able to spend a whole lot of time with it yet, but here are my first impressions.
First of all, it's hard not to compare it to an iPad in your mind. They're pretty much the same size with the same size screen, although the TouchPad feels a tad bit heavier in my hands.
Keep in mind that the TouchPad is truly a post-PC device; at no point do you need to connect it to a computer for setup, syncing, etc., although you CAN connect it to transfer media if you like. Setup, synchronization, etc. are all done through-the-air.
The first thing I noticed is the interface - a menu bar of sorts stays open at the top of the screen regardless of which app is open, and this menu bar rotates as you rotate the device to stay at the top of what you're viewing. This menu bar has options for the open program, as well as a Wi-Fi icon, the time, the notifications area (more on that in a moment), etc. It's very OS X-like, but even less intrusive.
Interacting with the device is very pleasant - touching the screen gives a visual "ripple" effect, similar to what you'd see if you touched an LCD screen, and it shows you exactly where you "clicked" on the screen. It sounds much more intrusive than it is; I actually find it quite useful.
The soft keyboard is nothing short of excellent. No need to shift to enter numbers or common punctuation, and letters on the keyboard itself display as lower- or upper-case, depending on whether the shift button has been tapped.
Performance is very good - apps open quickly, there doesn't appear to be any lag anywhere that I've been able to find. The sound is pretty decent - the thing has stereo speakers in landscape orientation. This would be fantastic for watching a movie.
Multitasking is excellent, and in my opinion much better implemented than in iOS. You can view open apps on the desktop screen as "cards," rearrange them, group them, select them, etc. To close an app, simply slide it off the top of the desktop. Overall, it's very nicely done and easy to use, and switching between open apps is very easy. It's also very easy to see what each open app is doing; you can view each app's screen on a card, rather than simply seeing icons for each open app.
The notification system is very nice to use. In the menu bar a series of icons will appear if you have an email, Twitter mention, etc. If the device is off, a small popup will appear on the screen to inform you of a new message or whatever.
I haven't been able to evaluate the battery life yet. In fact, I don't even think I've fully charged it yet (I started to play with the thing as soon as I got it out of the box).
You might have guessed, since I'm comparing this to an iPad (believe me, if you've handled both the comparison is inescapable), there are some ways in which the TouchPad doesn't quite measure up.
The image quality of the front-facing camera leaves a bit to be desired. There are no native apps for using the camera for anything other than video chat (third-party apps do exist), so perhaps the so-so quality of the camera can be excused...somewhat. It's clearly meant to be used for chatting, not for taking pictures; use your phone or your webcam if you really need a photo.
Text editing has a few idiosyncrasies that I'm not fond of - positioning the cursor is not nearly as easy as it is on an iOS device, since your finger covers up the position of the cursor as you're trying to place it (for example, between two letters). In iOS, the cursor and word(s) you're selecting appear above your finger for easy positioning. HP could have taken a lesson from Apple here.
This may sound like a whimsical gripe, but I'm really fond of iOS' double-space-to-period shortcut. WebOS doesn't have this, that I've found, and I already miss it.
Finally, and perhaps most importantly, are the applications themselves. The App Store from Apple has an incredibly robust selection of software for iOS devices. The number of apps available for WebOS is by no means small, but it's not up to the standard set by Apple. The apps themselves seem to be well-written and easy to find, but if you've been spoiled by Apple's vast offering, you'd be a bit disappointed with the more limited selection for WebOS.
Overall, the TouchPad is a very impressive device that perhaps could have given the iPad a run for its money at a more reasonable price point. It's more than worth what I paid for it ($149/32 Gb), and I'm sure I'll get a great deal of use from it. It's sad to think that HP has killed it, hopefully some of the rumors are true that it might be resurrected. If you get a chance to buy one, it's definitely worth considering.