I believe that NIT are more or less a FLOP.
Otherwise there would be no good reason to hide the sales numbers.

In France almost nobody have ever heard about NIT.
The very few geeks who tried it had old versions of Maemo and very few interesting apps, so they believed and told everybody the same things that you can read in every review on the Web :

"NIT COULD BE INTERESTING BUT IS USELESS AND SUCKS"
- the only thing it can do quite well is web browsing
- it can NOT replace a PDA because of no PIM app
- it can NOT replace a media player because of poor video (which is not so bad but nobody knows it)
- it can NOT replace a handheld computer ...

All of this is false, N810 is the best PDA I ever got ... but this is only true because of the community around Maemo.

Nokia didn't advertise properly about NITs and focused on an extremely limited use : web browsing via WIFI. But in most cases, we don't have acces to WIFI ... even in Paris streets. And most of the people wouldn't spend so much money just for in bed or sofa or toilets home browsing.