As working in technical planning in a mobile solution company, we definitely have NO interest in developing software for N900 or Maemo.
Reason is simple: it's not where the money is.

We are working directly with Qualcomm and Verizon on BREW, Windows Mobile and recently Android, those are big platforms, lots of potential money. We also have done some demos for Symbian, that's the only Nokia platform we're intersted in as that's is also a big market.

If you're looking for LOTS of applications and games, don't bet on Maemo, as least not in 2 or 3 years.
Until there are many Maemo devices are sold, not many companies will invest in developing software for this platform, other than Nokia itself, but Nokia has its own larger share of Symbian phones they have to commmit to.