How about a "discussion" checkbox for StackOverflow and SuperUser?
33644
Should we have a subjective version of every Stack Exchange site?
157730
The question wizard might be useful for Meta Stack Exchange too; should we give it a try?
34682
Stack Exchange needs a better way to inform their moderators about feature and policy changes
74991
Social events for Stack Overflow users
32928
Notify users of possible reviews on toolbar
128175
Could the favourites mechanism be extended to include comments?
88039
Would it be possible to have a "community accepted" feature?
17209
Propose Newbie-Overflow site or section
72119
Stack Exchange Site for Deciding Where to Post Questions
1941
How can I encourage Stack Overflow to rein in the 'subjective' vigilantes?
19672
FAQ for Stack Exchange sites
93849
Is there any way I can organize my favorite questions on StackOverflow using self-defined categories?
127589
Where can questions about our community-run moderation tools be asked?
924
Give each site a parallel site for polling, recommendations and subjective-ish stuff
126742
Can moderators see each user's Votes tab?
80261
notification for comments on Example Questions in Area51
87776
Allow voting on comments from Review interface