I've had my 770 for about a week now, so here's my first impressions:

That screen: Everyone says it, but "zowie!". Just gorgeous. The rest of the device is just a box to carry that screen.

Overall construction: nice and simple. I'd like a slightly more rugged case, but that's an aftermarket thing (I'm thinking like the PalmGlove that's kept my M105 alive for four years of abuse...). A bit of neoprene, a little magnet to turn the screen off, and a rigid bit to protect the screen. Are they on the market yet?

The openness of the platform is of course totally addictive (you should see the faces of geeks when I spark up XTerm). It turns the device from a consumer product into a community product. The potential of this thing is eye-bleeding. But I'm just as stoked that the out-of-the-box interface is slick and works well. Good work, design team: the various bugs and interface clunkiness can (and doubtless will) be ironed out in future firmware releases. Who do we refer those to?

Handwriting: If I get another capital-P mid-sentence I'll cry. The recognition doesn't seem too good at x-height (the height of the lowercase "x" and things like the lowercase "p"). A dotted line on the recognition window, and user-settability of that line's height, would IMO be a big improvement.

PIM: Yes, I know its not a PIM, but I don't want a bag full of devices. In fact, I think the 770 is intended to access any PIM functionality just like anything else, via the web. Which is an interesting idea, but I'm not putting my personal phone book and password list on Yahoo! The GPE PIM is clearly work-in-progress and desperately needs appropriate sync for this class of device. Encrypted sync to an arbitrary FTP destination which also hosted a web PIM app - that would rock.

What am I using it for? So far I've been using it as the "magic magazine" - its designed use - IMDB from the sofa, recipes from the kitchen, news on the loo, and so on. But I've used it just as much as an ebook reader, and that did surprise me. The screen is the first one good enough to read for a decent length of time, and I've been chewing through weighty texts (the Iliad, the Hacker Crackdown) without getting a headache. FBReader, full screen, portrait mode, the zoom buttons for page up/down: sweet. The return of reading in bed

The other use it's had so far is as an ad-hoc notepad. The Sketch app is ideal for taking down who's having what in a round of drinks: nothing to learn! (And beery fingerprints all over that screen... weep!)

So, what do I want from this thing that I don't think is currently there?

* Some UI tweaks that have come up on a zillion other reviews and posts. RSS news feed and Internet Radio station subscription come to mind first.

* More reliable handwriting recognition.

* Bluetooth networking. The how-to's work but aren't exactly a slick user experience. Yes, this is outside the original spec, but I have a specific need: 802.11/x isn't permitted at work, Bluetooth is.

* That PIM. It really really needs sync of one sort of another. But the developers know this already.

Overall, though, it's just gorgeous and I'm stoked