Pardon me if this rambles just a little. I have been an active member of StackOverflow for around a year now, but I have only started reading and listening more to Jeff and Joel's thoughts on where they see the concept going, and an idea was kind of simmering there.
The thing that has really built the StackOverflow community is the ready availability of truly useful information, and the ability to add information to that growing stack. One thing that I have been looking to see for a while is some place that just contains the hard information about the specific subjects. Think the wikipedia idea but focused more to an individual communities needs.
My thought was something like wikipedia in terms of you could have an article on LINQ and then users with sufficient rep could attach questions relevant to that article. I don't know if this concept make sufficient sense or not, but thought that I would throw it out there.