I got a chance to play with the HP Touchpad with WebOS at Best Buy yesterday. They had an HP rep there too. Here's my review which echoes what other blogs have been saying and some other things.
The thing definitely has some heft to it. Lighter than a laptop for sure but the heaviest tablet I've handled so far. The Just Type feature is great. Videos looked just as good as my laptop. Internet is fast using the HP reps Clearwire Hotspot. I like the notifications. The Facebook app is weird to me. I couldn't get any of the ebook readers apps to work since I have to register and there weren't any ebooks pre-installed to test out. The e-book reader apps ask you for what device you're using but WebOS is not an option. Other than that, the software is just plain fantastic. A very natural gesture based system. The software keyboard is great. You can control the key size and the number/symbol row on top is better than the iOS implementation.
The hardware of course is just ugh. Speaker cut out digs into your hand. The oval like slit button at the bottom either needs to be bigger or changed to a touchpad like button on the Palm Pre for Verizon (not the click button for the Pre on Sprint). However you get the same functionality if you swipe from bezel upwards which is great in any orientation. Speaking of orientation, it sucks. When you switch between portrait or landscape, it gets confused. It'll work itself out eventually but my goodness that's a bug that needs to get killed. I liked the curved sides but it doesn't feel grippy enough. No SD card reader so you can't expand the storage space.
Later my wife dropped by. She shares the same thoughts as me. She could watch her youtube videos. She could watch her Chinese drama in whatever video format they play in. They have a Citrix app so she can remotely log in. The big plus was she can actually log in to her online classes she's taking. She can't do that with Apple and the android tablet had jerky internet scrolling and failed to load. The issue she had with the WebOS was she can log in perfectly but she couldn't log out. The navigation bar had the log out button but when you pushed it the entire bar disappeared. She did get some message about some issue with java before the site loaded but it looked like it loaded fine. We had to clear all the cookies and cache to log her out of the site.
That said, she had pre-ordered it through costco which gives you a free case. 90 day return policy and no restocking fee. She's going to use it when she goes to Georgia and see if it's a good laptop replacement.