I don't know, I used to use the radio a lot. I live in Japan now so and there really isn't a lot on the radio over here.

But, I was myself considering trading up my n800 to an n810 and I decided against it for a couple reasons.

1. The hardware keyboard really wasn't that big of an incentive as I thought. I liked the prospect of having one but after using one for a bit I decided I would be better off investing in a BT keyboard. I like the idea of not having to type with just my thumbs.

2. I heard a lot of people say that the GPS wasn't that great. Granted I would probably use it occasionally it just didn't seem like a good enough reason. I got a BT GPS from a friend who had no more use for it so I have been able to augment that need as well.

3. SD slots. I didn't think it would be a big deal at first but it really was the deal breaker for me. I have an 8gb and a 4gb SD card and I really appreciate the ability to have 8gb of music on the internal and then be able to take out the 4gb while listening to said music to swap files between my laptop and my n800. I suppose I could just use the USB cable but I have a card reader on my laptop and I have to use it for something don't I?

Anyways, if you are looking for a Nokia tablet and you want to do it on the cheap I would suggest going with the n800. Just look in the "buy and sell" section and you will find plenty of n800s with accessories for under $200. I have seen some n800s go on ebay for around $120 as well. Just my two cents though.

Correct.
Incorrect. The speed depends on the operating system version. N800 runs at 400MHz too, when using OS2008 (e.g. Diablo)
So does the N800. The difference is that N810 uses a micro USB connector instead of mini, and the method for activating usb on-the-go (OTG) is slightly different if I'm not mistaken. But otherwise they're similar.
No. Both have 128MB RAM. The N800 has 2 full-size SD slots, while the N810 has a single mini-SD slot, and instead of the "internal" SD slot that the N800 has the N810 has a fixed-size, non-replacable 2GB flash where the "internal" slot used to be. That's the best way to view the situation, the way I see it.
Correct. The N810 built-in GPS is not very good though.

And as has been mentioned already, the N810 has a transflective screen, which means that it's to some extent possible to see it in direct sunlight.

Oh, and the N800 has a built-in FM receiver, the N810 does not. I think that covers the main differences.

No, it's only a formfactor change. Pin 5 floating/grounded is still the way OTG is changed.

He was talking about 256MB NAND, but, yes, but have 128MN of RAM, both have 256MB of NAND where the OS, kernel, initfs, etc. are stored.

I'd say the N810's GPS is close to useless, it never locks anywhere near quickly enough (frequently it never locks at all!). No idea what went wrong there, because all other GPS Nokia devices I've used work fine. For some reason they really messed up with the N810 GPS.

If you're looking for major advantages of the N810 I'd say it's the physical keyboard, the more sun-visible screen, and the generally more "sexy" casing.

If you don't want any of those things, then get the N800 instead as it has more memory card options and a built-in FM radio.

For me the gps is not useless. Sure my BT GPS gets a fix within a minute but the n810 GPS still locks in a couple of minutes most of the time.

The screen was my main reason to upgrade from an n800 to an n810. I like the keyboard too because I use the Vim editor a lot, which is a pain to do with the onscreen finger keyboard.

It would be better if the n810 had two microsd slots instead of one minisd.

That was the main thing for me, that the n800 had two SD slots.

I have seem to be using my n800 a lot more outside than I was before and the transflective (right term?) screen was the thing that got me thinking about upgrading.

i'm getting a 810 soon, and the screen is an issue. it also looks slicker, also less wider.