Here are some reasons why there is little commercial development for the N900 and we are largely just getting apps from the "Linux Arts & Crafts Movement"

-Nokia hasn't published any numbers as to how many n900's have been sold, so developers have no idea how big a pool of potential purchasers there are. If you are coding for your dinner, this is important. Apple & Android offer a huge number of potential purchasers in comparison. Hell, Palm probably offers a huge number of potential purchasers by comparison.

-The Ovi store experience is extremely rough when compared with the app store experiences for Iphone & Android platforms.

-The perception is that Nokia largely abandoned the Maemo 5 platform almost as soon as it launched it. Why bother coding for a relatively small, abandoned user-base who will probably have moved on to something else by the time you are ready for release. Remember, coding substantive applications for commercial sale takes investment in time & money and is often about hitting a moving target at just the right time in the product release cycle.

-Nokia's corporate structure and executive leadership is in flux & Nokia has neither exhibited or made huge commitments to Maemo/Meego in the past. Even if they publicly threw their entire weight behind Maemo/Meego now, who knows what the next batch of execs will decide. None of this is attractive to a developer.

Some of this may change once PR 1.2 is out and developers get a hypothetical bridge to Meego with the next QT.