I used to run a site out side of maemo.org and I closed it be cause why should I spend money on hosting a site if maemo.org will host it for free.
Its not that we are so much against another site if someone wants to pay to host it and design it then I would most likely put my themes there as well, but no one is offering to do just saying we need one.
Edit: I just picked up n900themes.com/n900wallpapers.com so I'll see what I can do about getting a site up in the next few days.