Got my 770 a couple days ago. I have no wireless or blueteeth devices, yet.
Wireless router on order. Should arrive in a week.
So, despite this, it is really quite functional.
Discovered that a neighbor has open wireless - thanks, whoever you are.
I was able to download stuff from an open house window. As i've only been home after midnight, my neighbor probably didn't notice.

Good:
770 is discounted - probably due to new model. I might get a spare. This strategy worked well when i bought my Palm.

Awesome display (i've got excellent vision for close fine stuff, despite my age - YMMV). Readable outside in daylight - though not as good. My Palm happens to totally rock outside - passive B/W LCD. My Palm happens to also be awesome at the telescope. It's totally punny backlight does not destroy night vision. Will need red cover for 700. Tech i have.

Performance - like my old Pii/360 in CPU, memory, slightly less disk (flash). Both do full screen video. But 770 fits in my shirt pocket. My Palm is currently there, but for how long?

Quiet. I'll actually use it to read PDFs. I never used to like PDFs. You'd either print them or sit next to a noisy box in an uncomfortable chair.

Multitasking - i'm replacing my Palm, this is a real plus. The Palm really does not compute unless you wait for it. Runs Linux, like my desktop. I've been using Unix since 1982 - so the learning curve is mostly behind me. Even for the new stuff.

Battery life - seems good, charges fast. My Palm is better - two weeks on twin AAA's, and i can carry spares... and replacement AAA rechargables are cheap, but the two are otherwise hard to compare. My palm doesn't play audio or video, and IR compares unfavorably with WiFi. Both do USB.

Stand alone - can operate without the network.

xterm, perl come standard, other languages available. Is there emacs? (i can cope with vi).
perl just works. Is there a maemo GUI library for perl?

Stable - no crashes (yet).

Works with my images (jpg).

Works with my audio (mp3).

Browser should allow usable HTML book reading (offline). Haven't tried it.

Sound (especially with headphones) is high quality. Many x86 laptops come with brain dead sound - for example, you can hear electrical noice when CD changes tracks, or hard disk head moves. But also, laptops have fans, and hard drives that make noise - which effectively reduces quality. The supplied ear buds actually fit in my ears. One of my ears makes this difficult at best. This is the ONLY pair that seems to work.

Bad:
If you shut down, PDF reader, mp3 player, etc., forget where they were. Two days to figure out how to put it to sleep. The case does NOT have any remotely obvious mechanism to make this happen. Difficult to see that the screen has actually turned off when the cover is on. How does it work? Magnetism? RFID? Dark magic?

Two days to figure out where the escape key is. Killed xterm, but vi was orphaned several times. Rebooted to get rid of them. Why isn't there a keyboard screen with control chars and escape? I'd have found that...

None of my downloaded videos play. What do i need to do? Hard to imagine that there's enough local space for video files. Barely enough for audio. Maybe streaming audio or video will be something i'll use one day.

One of the open WiFi places i frequent redirects to an agree-to-our-terms page. The 770's browser can't get by it. Probably some javascript error. Feh. Another browser?

Though screen responds to fingers, my oily fingers mess up the screen. Now carry a lens cleaner rag in bag. High res screen is best clean.

Power cord barely works while device is on a stand. Have right angle headphone jack - is there a right angle power jack?

Manual says "don't overcharge". If powered up while charging, it tells you when it's topped off. But not if it's powered down. It'd be MUCH nicer if you could leave it on A/C and it would internally do the right thing by the battery. The device clearly knows. So all it has to do is do something about it.

Unknown:
My Palm has a totally awesome planetarium app. No idea if i'll be able to settle for 'stars'.

My Palm comes with an adequate calendar app. I can cope with a calendar that doesn't sync with other hosts. Depending on a net connection eg:google's calendar) is a non-starter.

I'll need a plain text book reader. Might just use 'less'. On palm, weasel reads compressed books. So, maybe zless. There's pkzip/unzip - is there gzip? bzip2?

Haven't tried the handwriting recognition. On Palm - grafitti and 'keypad' are same input speed - about 8 WPM. But grafitti doesn't consume screen area. Will want to get wireless keyboard - to make use of 70 WPM skills, from time to time. First, i'll log into the unit from desktop, to see if i like it.

If 770 can do USB TCP networking, can it act as a host to a USB thumb drive? USB 160 GB external hard disk? USB printer? USB iPod? Palm doesn't print. Does 770?

What's the biggest flash card available? Where? What cost?

There's a microphone on it (for internet phone)? Where is it? Are there sound recording apps? If not, why not?

Some of these are doc issues. I've only read the manual once. Maybe it's there, and i missed it. This forum has answered several of my questions.