In the long run it seems Nokia is shooting itself in the foot application and compatibility wise. Like it's been pointed out before, resistive and capcitative touch screens have their differences and their are pros and cons to each use (for example, pin point accuracy).

Not to mention it seems Maemo 6 + Device will be released in late 2010? 2011? Assuming all the developers here get the n900, what's their motivation for buying the next device and then creating apps for that (unless Nokia is giving it to them or selling at a developer discount rate). Especially given the price of the current n900 (at least $500!). Even game consoles live longer then that. Then your problem is, you design an application but it may be hard to run on two different operating systems with possibly two different control methods. For example, see the iPhone + iPhone 3G vs. iPhone 3GS. And for that it's just a memory and cpu difference! Most developers on that platform just build their applications for the older generation in mind and avoid implementing features unique to the 3GS)

@qgil, true it might be worth developing in QT. But some people prefer GTK and sometimes applications are simply just ported over with little optimization.