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But you would be looking at a device that last about a hour, the most 2, on a single charge. In addition to that, the price would be too high to justify buying an all-in-one device as stated above.

- 400 MHz Intel XScale CPU
- 128 MB (but faster) RAM

Both are possible but very expensive. Especially with so much RAM. If I had a PDA, especially a PocketPC, I would much rather have 16-32MB; using a MMC/SD/MS for data storage. Now, just say I'm stuck on a bus (or a train, or whatever), I just reach into my wallet, get out the appropriate card (i.e. music, or a collection of Java games, etc.) and occupy my time.

- 1MP color still camera & 320x240 DV camcorder/web-camera (with recording capabilities)

Since it is done on mobile phones (especially Japan), I have no reason to believe this isn't possible. However, remember, it would be expensive. Worser still, with 128mb of RAM - how much footage do you plan to get?

Bluetooth and Infrared capabilities (to synchronize my... phone

Infrared is either dead, or in its last stages of dead. Bluetooth is mostly hype. But either way, both can be incorporated into a PDA without taking too much space or power; but as for Bluetooth, it would be expensive.

Good built-in Wi-Fi support (this is an absolute must)

Can be done, but don't expect small sizes and long battery life. Or flip it around, don't expect reliable reception at hotspots.

8 MB ATi Radeon with hardware 3D capabilities (poor man's gaming console)

NVIDIA, and I believe, ATI either plans to introduce 3D cards for devices such as PDA, or already have them. Either way, don't expect too many 3D games actually taking advantage of the 3D card, especially with the processor and storage limitation.

16bit sound (good quality speaker, earphone jack, built-in Microphone (Line-In?))

Can be done within a small contrain of size (as proven by flash-based MP3 players).

Jog Wheel (to scroll web pages!)

Say goodbye to screenspace, or hello to longer, and quite possibly, larger PDAs. But technically possible.

Handwriting recognition, basic voice command/recognition, Voice-recorder capabilities

Even Zaurus have relatively good handwriting recog. Don't expect however anytime soon where it would be perfect (especially if you and nobody else can read your handwriting). Personally, I hope soon there would be handwriting support for scripts other than the Latin, Chinese, Korean and (3) Japanese scripts in PDAs.

I however much prefer a thumbpad like on Treo, some models of Clie, Zaurus, etc, as well as a 5-way navigation button. Makes using a PDA much faster and easier (especially with current itterations of Pocket PC).

Upgradable OS feature with good such support from manufacturer

Possible, but not such a good idea. While I don't mind running OS 4.x on my Palm Vx, I doubt I can take advantage of any of its features. Sure, I would prefer to have each PDA designed for the OS it is running.

1-2 built-in expansion slots (whatever's best, might be an idea to include a real hard drive)

Most PDAs have this. However, don't expect hard disks in PDAs (unless you're gamed for a PDA that goes off within a couple of hours).

2 USB ports (including support for USB key external drive)

Maybe one USB port would be nice (i.e. thumbdrives), but 2? Why would anyone need 2 USB ports on a PDA? Besides, most USB controllers are rather big (in comparison with other PDA components) and most USB devices require the USB port to supply power (in other words, it would drain the battery faster).

24bit color VGA 640x480 backlight TFT (or 320x320 in worst case)

Possible. But I would think that the resolution is a overkill (unless you plan to increase the size of the PDA screen).

Good software/hardware Mp3/Ogg capabilities (poor man's iPod)

Quite possible indeed, on any PDA (the big problem is that the output audio is normally crappy).

Reasonable battery life (I realize that all these features will drive battery life down)

Hopefully, reasonable for you mean 1-2 hours. However, there is strives in fuel cell technology that probably would reach the market in a year or two.

Up to 300 grams and with size similar to today's PocketPCs

Except for the USB ports; all of these can be incorporated in a PDA (thankfully, you didn't request for GPS.

Bags of software and some shareware apps/games pre-installed

Why? If you want a certain specific application, download/buy it yourself. Adding software that most potential customers won't use is not only a waste on the limited storage, but would also drive up support costs.

[If phone capabilities are doable, that's good. If not, that's ok too, for now]

For all the features you've mention, especially the screen, the jog dial, camcorder, etc. it seems a big waste if there isn't GPRS (and hopefully WiMAX) support. And after that, it is only a few steps away from offering GSM support (not too familiar with CDMA).