I'll detail the N810 in your points:



Good internet capabilities(flash, java?): The built in Mozilla browser has the latest Flash 9 support, although no Java.

Versatile Video capability(divx, xvid, ogg etc.): Mplayer will play many formats, and can play xvid files at around 400x240, and even up to 640x360 in some cases.

Document storing(word processing, spreadsheets): Gnumeric is practically identical to Excel, and works very well, even supporting graphs and charts. Word documents are still a bit iffy, they can be easily viewed, but not so easily edited. Abiword has been in private testing for some time, although it can be pretty buggy, and very annoying when it locks up and you lose your document.

IM: Pidgin is my personal favourite, as it is very minimalistic and works perfectly with the hardware. It also has the most popular protocols, such as MSN, AIM, Yahoo, Google Talk, and more. Rtcomm beta gives you these on the N810's default chat application, tying your IM'ing well with the operating system. However, I've never been able to install it properly, so I can't recommend it.

Easy/swift Email client: The built in email program is a bit shoddy, I'd recommend Claws Mail, which is a very robust client.

Wifi(use phone as wifi hotspot): I'd imagine so? Although your next point erases the need for this.

Bluetooth for tethering to 3G: The N810 internet tablets have bluetooth 2.0, and support nearly every phone, both for file browsing, and internet connection sharing.



Also, if you're not too fussed about the sliding keyboard and GPS, you might be best off with an old N800, the specs are identical (afaik?), and it's much cheaper. And, the N800 has two full size SD slots, while the N810 relies on MMC cards.

Hope I've been of help!