Well, I am one of the moderators of the German dslr-forum for DSLR Cameras. We are residing on rank 2 worldwide for forums about cameras:
http://www.big-boards.com/kw/cameras/
Having about 250000 registered users and a all camera producers on board, I can tell you for sure, that 95% of our posts are more or less useless....
Here we have much more useful posts, because users are high expertise geeks. Both kinds of communities are overrated. There is a lot of work needed to extract knowledge from our mass forum there. There is also a lot of work to translate the geek experience here into mass compatible concepts. We have discussed this all with camera producers like Canon, Nikon and Pentax. That is my conclusion, Communities are overrated but you can't ignore them.
It is good that Nokia is attending us here. But it is a too easy just to ask about multitasking. Take the example iPhone again. The OS is able to handle multitasking. The didn't only cut that of. There are notification services for example implemented for Skype so it starts when someone wants to contact you while you are doing something else on your phone. So there is an idea and concept behind that. Mutlitasking means cpu usage and that will reduce battery life. That is one of the reasons for Apple avoiding that. My hint wasn't intended to be nonconstructive. My intention was hoping to get into a good way of discussion. Communities turn into something wonderful when you work with them, especially high expertise communities. But that is some long-term return on invest thing. IBM is demonstrating that in the field of open source development. But they invest a lot...
All in all thanks to Nokia for the poll.