This looks very good, but I don't think it is fair to compare it to the N800.
The N800 is a real product that you can buy already.
I believe the Intel product are scheduled for 2008 release. A LOT can happen in a year. If you look at the difference between the N800 and the 770, that was a year of work at Nokia.

I'll bet that the next Nokia tablet will look a lot like this Intel MID (performance wise) .

I love the Opera browser, and I don't think that "tabbed browsing" is an advantage on such a small screen.

I do think it is a good idea to switch to x86, because it opens the door to a lot of (non open source) software.