All I can say is that I don't -want- iphone apps.
Mainly because they are all closed source. The whole reason to -have- a N900 is because most of the os, and almost all the apps are open-source and can be FIXED if they break, or the developer abandons them, or even if you want something the developer won't add/change.

As it is, I see far more usable tools than the iphone has apps, and most of ours are free!