I think everything on my list has already been mentioned here, but I'll still type 'em myself
1. The messaging app - I really came to like that I was talking to a person over a service rather than using a service to talk to a person. I could easily switch in mid conversation from SMS to gmail chat. Most of the time when I got a message, I didn't even know (nor care) which service it came from, I just replied to it.
2. The touchstone - I still have it setting on my desk even though it's not doing me any good. Fantastic piece of hardware. Both charges the phone and keeps it at a readable angle.
3. Notifications - I dislike Android's notifications. The email notification tells me I have a new message and what mailbox it's in, but not who it's from or what it's about. And I can't individually dismiss the notification (in webOS, you just swipe it away and that notification is gone while the rest remain). Android's not as bad as iPhone, but still not as good as webOS.
4. Gestures - I can't tell you how many times I've swiped up from the bottom to get into card view or done a back gesture since I've got this thing

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5. Quick access to WiFi and Bluetooth - Swiping down from the top right corner brought up the menu to control and configure the radios... no matter what application was running.
6. A physical keyboard - Autocorrect makes typing bearable, but I'd still rather use a physical keyboard.
7. Universal search - Start typing anywhere (even in a lot of the apps) and the thing started searching. If you were in cardview (or had no cards open), it'd start searching the whole phone (apps, contacts, etc). Really surprises me that Palm has better searching than Google

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8. Easy control over what's running - webOS had the best multitasking around. Android does it, but it controls what's running in the background. On webOS, I have control... fling the app off the screen and it's gone. Not running anymore.
9. Homebrew - Don't like the way something works? There's probably a patch for it. Rooting doesn't exist in webOS. While Android isn't as bad as the iPhone from a control standpoint, they're also not as open as Palm.
Palm is linux on a phone done right. Android is a bunch of crap thrown together and called a phone OS. Android has more momentum behind it, but I really think Palm has the better product. The only reason Android is doing as well as it is is because Google is backing it. Anybody else, and it would be an also-ran.
That said, the hardware on this thing is outstanding. The OS if functional enough. It's a great phone to get me by until Palm releases something on better hardware. Of course, who knows... with Google
grabbing Palm's UI guy, maybe Android will start to look better instead of cobbled together.