I mainly use StackOverflow.com.
Sometimes I need to ask a question which isn't very programming-related yet I'm sure that if I'd ask this question in StackOverflow.com I'd get answers, good community.
When writing this very question I have the "main" block of the page (on the left) and on the right I see the "How to Format" div (or call it a column).
So, the idea is very simple;
Have the same column on the main page (of stackoverflow.com and "friends"), just that it takes random questions from random sites under the SO family and writes them in smaller yet with the same stats as normal so it'll be interesting to watch once in a while, you know, maybe something new....
1) It'll give much wider diversity of content and I'm sure many will like it.
2) To questioners it'll give the opportunity to have the question exposed to many people of other trades which might result in an even more interesting replies/answers.
If you like the idea "stack overflow internet services, inc" I'm willing to sell it to you for ONLY 10,000 Reputation points (at StackOverflow.com eh?!) =)