Hm, I am not 100% sure, but I was of the opinion that there is the netbook remix and there is also a special edition for MIDs:
http://www.ubuntu.com/products/mobile

Optimized for small screens like on the n810 with special interface, but not for our kind of processors. Now that those processors (yes, I forgot the name A-something) are supported too, wouldn't the Ubuntu MID version be a good idea for the n810? Perhaps also less laggy?

Or am I mixing up things here? could easily be, it's hard to keep up with all the stuff happening!