I really don't see this as a big deal. This is the nature of the electronics business, plain and simple. It seems as if Nokia has learned a lot from the 770 and N800, so they are improving them quickly, which is a good thing, IMO. Otherwise, they wouldn't be able to keep up with the competition, and changes in the industry.

I bought a 770 a couple months back because it was cheap. Even though the n800 is out, the 770 is not obsolete. I have a full assortment of apps on it, and am even running the same os (OS2007HE) on my 770 as the n800.

Because these tablets are open source, there will be development on them for a long time coming, long after the new stuff comes out.

Look at graphics cards for PC's. nVidia releases a new line of cards every 6-9 months or so. When the GF9000 series comes out, the GF8000 series won't be obsolete at all. Hell, I'm still using an old GF4 on one of my PC's.