Just found UserEcho.com and I really liked their interface to ask questions (driven by a search first).
So to see how it works in action, I just created an Free account for the O2 Platform: http://o2plaform.userecho.com/
Here is what it looks like:
It looks like you can add ideas, questions, bugs and praises.
So if you have one of these related to the O2 Platform, please post them at http://o2plaform.userecho.com/